Nominal voltage of nickel metal hydride batteries. Nickel-metal hydride accumulator batteries (Ni-MH). How these devices are used

The scope of the use of electric batteries is pretty wide. Small batteries are equipped with familiar household appliances, the battery is slightly large, cars are equipped, and very large and capacitive batteries are mounted in industrial stations loaded. It would seem that in addition to custom purposes from different types of acb can be common? However, in fact, similarities have more than enough similar batteries. Perhaps one of the main among the possible similarities of the batteries is the principle of organizing their work. In today's material, our resource decided to consider exactly the same. To be more accurate, then it will be about the functioning and rules of operation of nickel-metal hydride batteries.

The history of the appearance of nickel-metal hydride acb

Creating nickel-metal hydride batteries began to cause considerable interest among engineering representatives more than 60 years ago, that is, in the 50s of the 20th century. Scientists specializing in the study of the physicochemical properties of the AKB, seriously thought about how to overcome the shortcomings of nickel-cadmium batteries popular at the time. Perhaps one of the main objectives of scientists was to create such a battery that could accelerate and simplify the process of leaking all reactions associated with electrolytic hydrogen transmission.

As a result, it was possible to use specialists only by the end of the 70s, and then create and fully experience more or less high-quality nickel-metal hydride batteries. The main difference of a new type of battery from the predecessors was that he had strictly defined places for clustering the main mass of hydrogen. More precisely, the accumulation of the substance occurred in the alloys of several metals located on the battery electrodes. The composition of the alloys had such a structure that one or several metals accumulated hydrogen (sometimes several thousand times higher than them), and other metals performed as electrolytic reaction catalysts, providing a hydrogen transition to the metal grille of the electrodes.

A battery, having a hydrogen-metal hydride anode and a nickel cathode, received an abbreviation "Ni-Mh" (from the name of conductive, accumulating substances). Such an acb on an alkaline electrolyte is working and provide an excellent charge-discharge cycle to 2,000 thousand for one full-fledged battery. Despite this, the path to the design of Ni-MH batteries was unclear, and currently existing samples are still upgraded. The main vector of modernization is aimed at increasing the energy density of the batteries.

Note that today nickel-metal hydride acb is mostly produced based on the alloy of Metals "LANI5". The first sample of such batteries was patented in 1975 and began to be actively used in the wide industry. Modern nickel-metal hydride batteries have a high energy density and consist of completely non-toxic raw materials, which simplifies their disposal. Perhaps, precisely because of these advantages, they became very popular in many areas where long storage of electric charge is required.

Device and principle of operation of nickel-metal hydride battery

Nickel-metal hydride batteries of all dimensions, containers and destinations are produced in two basic types of forms - prismatic and cylindrical. Regardless of the form, similar Akb consists of the following mandatory elements:

• metalhydride and nickel electrodes (cathodes and anodes) forming a galvanic element of a grid structure, which is responsible for the movement and accumulation of an electrical charge;
• separator areas separating electrodes and also involved in the process of electrolytic reactions;
• output contacts in external width accumulated charge;
• the covers with the valve mounted in it required to reset the excessive pressure from the battery cavities (pressures over 2-4 megapascals);
• the thermal protective and strong housing containing the elements of the battery described above.

The design of nickel-metal hydride batteries, as well as many other types of this device, is rather simple and special difficulties in consideration. It is clearly shown in the following design schemes:

The principles of work under consideration of the AKB, unlike their common structural scheme, look slightly more difficult. To understand their essence, let's pay attention to the phased functioning of nickel-metal hydride batteries. In a typical version, the work stages in these batteries are as follows:

1. The positive electrode is an anode, carries out an oxidative reaction with hydrogen absorption;
2. The negative electrode is a cathode, sells a rehabilitation reaction in hydrogen sisabsidization.

In simple language, the electrode grid organizes the ordered movement of particles (electrodes and ions) by means of specific chemical reactions. At the same time, the electrolyte in the main reaction is not involved in the main reaction, but is included in operation only under certain circumstances of the functioning of Ni-MH batteries (for example, when recharging, realizing the oxygen circulation reaction). We will not consider the principles of work of nickel-metal hydride acb in more detail, since this requires special chemical knowledge, which many readers have no resource. If desired, learn about the principles of battery performance in large details should be applied to the technical literature that highlights the course of each reaction at the ends of the electrodes as in charge of the batteries and when they are discharged.

The characteristics of the standard Akb Ni-MH can be seen in the following table (column in the middle):

Operating Rules

Any battery is relatively unpretentious in maintenance and operation device. Despite this, its cost is often high, so each owner of a particular battery is interested in increasing its service life. Regarding the NI-MH formation ACB, extend the operating period is not so difficult. For this, enough:

• First, follow the battery charging rules;
• Secondly, it is properly operated and stored when simple.

We will talk about the first aspect of service Akb a little later, well, and now we will pay attention to the main list of the rules of operation of nickel-metal hydride batteries. The template list of these rules is:

• Storage of nickel-metal hydride batteries should be carried out only in their charged state at 30-50%;
• It is strictly forbidden to overheat the Akb Ni-MH, as compared to the same nickel-cadmium batteries considered by us much more sensitive to heating. Overloading work adversely affects all processes occurring in the cavities and on battery outputs. Tokopotdach is especially suffering;
• Never recharge nickel-metalhydride batteries. Always adhere to charging rules described in this article or reflected in the technical documentation for the battery;
• In the process of weak operation or long-term storage "Train" AKB. Often enough of the periodically conducted cycle "Charge-discharge" (about 3-6 times). Also similar "training" is desirable to expose new NI-MH batteries;
• Store the batteries of nickel-metal hydride formations are required in room temperature mode. The optimal temperature is 15-23 degrees Celsius;
• Try not to discharge the battery to the minimum limits - voltage, less than 0.9 volts for each pair of "cathode anode". Restoration of nickel-metal hydride acb, of course, is amenable, but it is desirable to not bring them to the "dead" state (on how to restore the battery, we will also talk below);
• Follow the structural quality of the battery. It is not allowed to have serious defects, lack of electrolyte and similar things. The recommended periodicity of the test of the ACB is equal to 2-4 weeks;
• In the case of the use of large, stationary batteries, it is also important to adhere to the rules:
  • their current repairs (no less than once a year):
  • capital recovery (no less than 3 years);
  • reliable attachment of the battery at the place of use;
  • availability;
  • use of the right charger;
  • and compliance with the safety of the use of such batteries.

To adhere to the described rules is important not only because a similar approach to the operation of nickel-metal hydride acb is significantly extending their service life. They also guarantee safe and, in general, trouble-free, use of the battery.

Charging rules

The earlier was noted that the rules of operation are far from the only thing that is required to achieve the maximum operational period of nickel-metal hydride acb. In addition to competent use, such batteries are extremely important to correctly charge. In general, answer the question - "How to charge the Ni-Mh battery?", Quite is difficult. The fact is that each type of alloys used on the battery electrodes requires certain rules of this process.

Generalizing and averaging them, you can select the following fundamental basics of charging nickel-metal hydride batteries:

• First, it is required to comply with the correct charge time. For most Akb Ni-MH, it is either 15 hours at a charging current about 0.1 s, or 1-5 hours at a charging current in the range of 0.1-1 C for batteries with highly active electrodes. Exceptions are recoverable batteries that can be charged more than 30 hours;
• Secondly, it is important to monitor the temperature of the battery in the charging process. Many manufacturers are not recommended to exceed the temperature maximum of 50-60 degrees Celsius;
• And thirdly, it is necessary to take into account the procedure for charging. This approach is considered optimal when the ACB is discharged to the rated current to the voltage at the outputs of 0.9-1 volts, after which it is charged by 75-80% of its maximum container. It is important to take into account that when a quick charging (transmitted current of more than 0.1) is important to organize pre-charge with high current supply to the battery for about 8-10 minutes. After that, the charging process should be organized with a smooth increase in voltage-supplied to 1.6-1.8 volts. By the way, with the usual recharging of the nickel-metal hydride battery, the voltage does not necessarily change and normally is 0.3-1 volts.

Note! The above-mentioned battery charging rules are averaged. Do not forget that for a specific brand of nickel-metal hydride acb, they can be slightly different.

Battery recovery

Along with the high-cost and rapid self-discharge, Ni-MH batteries have another drawback - a pronounced "memory effect". Its essence is that with a systematic charging of a not fully discharged battery, it seems to remember it and over time significantly loses in its container. To neutralize such risks, the owners of such ankb need to charge the maximum discharged batteries, as well as periodically "train" them by the recovery process.

Restore the nickel-metal hydride batteries with "training" or when they are strongly discharge, it is necessary as follows:

1. First of all, it is necessary to prepare. For recovery will be required:
   • high quality and, preferably, smart charger;
   • tools for stress measurement and current strength;
   • any device capable of consumeing energy from the battery.
2. After preparation, you can already wonder about how to restore the battery. First, it is necessary to charge the battery over all the rules, and then discharge it by voltage at the battery outputs of 0.8-1 volts;
3. Then the recovery begins directly, which, again, must be carried out in accordance with all the rules for charging nickel-metal hydride batteries. The standard recovery process can be conducted in two ways:
   • The first - if the AKB submits signs of "life" (as a rule, when discharge at the level of 0.8-1 volts). Charging passes with a constant increase in the supplied voltage from 0.3 to 1 volt with a current of 0.1 s for 30-60 minutes, after which the voltage remains unchanged, and the current force increases to 0.3-0.5 s;
   • The second is if the battery does not submit signs of "life" (when there is less than 0.8 volts). In this case, charging is carried out with a 10-minute pre-charging of high current for 10-15 minutes. After that, the actions described above are carried out.

It is worth understanding that the restoration of nickel-metal hydride batteries is the procedure that is required to be periodically carried out for absolutely all batteries (and "alive" and "non-living"). Only this approach to operation of this type of batteries will help "squeeze" from them maximum.

Perhaps this is the story on today's theme can be completed. We hope the material presented above was useful for you and gave answers to questions of interest.

If you have any questions - leave them in the comments under the article. We or our visitors will gladly respond to them

The main types of batteries:

• Ni-CD Nickel Cadmium Batteries
• Ni-Mh Nickel-Metal Hydride Batteries
• Li-ion Lithium-ion batteries

Ni-CD Nickel Cadmium Batteries

For rechargeable tools, nickel-cadmium batteries are actual standard. Engineers are well known for their advantages and disadvantages, in particular Ni-CD nickel-cadmium batteries contain cadmium - heavy metal of increased toxicity.

Nickel-cadmium batteries have the so-called "memory effect" of which the essence of which is reduced to the fact that during the charge of a non-fully discharged battery, its new discharge is possible only before the level from which it has been charged. In other words, the battery "remembers" the level of the residual charge, from which it fully charged.

So, when charging the non-fully discharged Ni-CD of the battery there is a decrease in its capacity.

There are several ways to combat this phenomenon. We describe only the easiest and most reliable way.

When using a battery tool with Ni-CD batteries, a simple rule should be adhered to: Charge only fully discharged batteries.

Pros Ni-CD Nickel Cadmium Batteries

• Low price Ni-CD Nickel Cadmium Batteries
• The ability to give the greatest load current
• The ability to quickly charge the rechargeable battery
• Saving high battery capacity up to -20 ° C
• A large number of charge-discharge cycles. With proper operation, such batteries work perfectly and allow up to 1000 cycles of charge-discharge and more

Cons Ni-CD Nickel Cadmium Batteries

• The relatively high level of self-discharge - Ni-CD nickel-cadmium battery loses about 8-10% of its capacitance in the first day after a complete charge.
• During the storage of Ni-CD, the nickel-cadmium battery loses about 8-10% charge every month.
• After long-term storage, the Ni-CD capacitance of the nickel-cadmium battery is restored after 5 discharge cycles.
• To extend the service life of the NI-CD nickel-cadmium battery, it is recommended to completely discharge it every time to prevent the "memory effect"

Ni-Mh Nickel-Metal Hydride Batteries

These batteries are offered on the market as less toxic (compared to NI-CD nickel-cadmium batteries) and more environmentally safe, both in production and during disposal.

In practice, Ni-Mh nickel-metal hydride batteries truly demonstrate a very large capacity during dimensions and mass, slightly smaller than the standard Ni-CD nickel-cadmium batteries.

Due to the almost complete abandonment of the use of toxic heavy metals in the NI-MH design of nickel-metal hydride batteries, the latter after use can be disposed of quite safely and without environmental consequences.

Nickel-metal hydride batteries are somewhat reduced "memory effect". In practice, the "memory effect" is almost impaired due to a high self-discharge of these batteries.

When using Ni-Mh nickel-metal hydride batteries, it is desirable to discharge them in the process not completely.

Store NI-MH nickel-metal hydride batteries follows in a charged state. With a long (more than a month) interruptions in operation, batteries should be recharged.

Pluses Ni-Mh Nickel-Metal Hydride Batteries

• Non-toxic batteries
• Little "Memory Effect"
• Good performance at low temperature
• Large capacity compared to Ni-CD nickel-cadmium batteries

Cons Ni-Mh Nickel-Metal Hydride Batteries

• More expensive type of batteries
• The size of the self-discharge is about 1.5 times higher compared to Ni-CD nickel-cadmium batteries
• After 200-300 cycles of discharge-charge working capacity Ni-Mh nickel-metal hydride batteries decreases somewhat
• Ni-MH batteries Nickel-metal hydride batteries have a limited service life.

Li-ion Lithium-ion batteries

The undoubted advantage of lithium-ion batteries is a practically inconspicuous "memory effect".

Thanks to this wonderful Li-Ion property, the battery can be charged or recharge as needed based on the needs. For example, you can recharge a non-fully discharged lithium-ion battery before an important, responsible or long work.

Unfortunately, these batteries are the most expensive batteries. In addition, lithium-ion batteries have a limited service life, which is discharged by the discharge-charge cycles.

Summarizing it can be assumed that lithium-ion batteries are best suited for cases of constant intensive operation of the battery tool.

Pros Li-Ion Lithium-ion batteries

• There is no "memory effect" and therefore it becomes possible to charge and recharge the battery as needed
• High Capacity Li-Ion Lithium-ion Batteries
• Small mass of Li-Ion lithium-ion batteries
• Record-low level of self-discharge - no more than 5% per month
• The possibility of fast charge Li-Ion lithium-ion batteries

Cons Li-Ion Lithium-ion batteries

• High cost Li-Ion lithium-ion batteries
• Reduced hours of operation at temperatures below zero degrees Celsius
• Limited service life

Note

From the practice of operating Li-Ion lithium-ion batteries in phones, cameras, etc. It can be noted that these batteries serve an average of 4 to 6 years and withstand about 250-300 discharge cycles during this time. At the same time, absolutely accurately noticed: more cycles discharge - shorter life Li-Ion lithium-ion batteries!

All these types of batteries have such an important parameter as a container. The battery capacity shows how long it can feed the load connected to it. At the radio station, the battery capacity is measured in milliamme aperture. This characteristic is usually indicated on the battery itself.

For example, take the alpha 80 radio station and its 2,200 mAh battery. When the cycle of work 5/5/90, where 5% of the operation of the radio station for the transfer, 5% of the work on the reception, 90% of the time standby mode - the operating time of the radio station will be at least 15 hours. The lower this parameter of the battery, the less it can work.

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Rechargeable batteries have become the main power source of modern devices operating on an electronic basis. Ni-MH batteries are considered the most popular, as they are practical, durable and can have an increased capacity. But for the safety of technical characteristics, during the entire period of operation, you should learn some features of the work of the drives of this class, as well as the correct charge conditions.

Standard Ni-MH Batteries

How to charge ni-mh batteries

At the beginning of charging any autonomous drive, whether it is a battery of a simple smartphone or high-intensive truck battery, a number of chemical processes begins in it, which is the accumulation of electrical energy. The electricity received by the drive does not disappear, part of it goes to the charge, but a certain percentage on heat.

The parameter for which the battery charging efficiency is determined is called the efficiency of the autonomous drive. The efficiency allows you to determine how the ratio of useful work and unnecessary losses that are leaving for heating. And in this parameter, the batteries and batteries nickel-metal hydride are strongly inferior to Ni-CD drives, since too much of the energy spent on their charge, parallel to heating.

Nickel-metal hydride drive can be restored independently

To quickly and correctly charge the nickel-metal hydride battery, it is necessary to establish the correct value of the current. This value is determined, based on such a parameter as the capacity of the autonomous power supply. You can increase current strength, but it follows in certain steps of charging.

Especially for nickel-metal hydride batteries defined 3 varieties of charging:

• Drip. It proceeds to the detriment of the durability of the battery, does not stop even to achieve 100% charge. But with drip charging, the minimum amount of heat is allocated.
• Fast. Following the title, it can be said that this type of charging proceeds a little faster, it is caused by the input voltage within 0.8 volts. At the same time, the efficiency rate increases to 90%, which is considered a very good indicator.
• Prepare mode. It is necessary for the charge of the drive to its fullest tank. This mode is carried out using a small current for 30-40 minutes.

This is the characteristics of the charge ends, now one mode should be considered in more detail.

Features of drip charging

The main feature of the Drop Charging NIZN, as well as Ni-Mh batteries, is to reduce its heating during the course of the entire process, which can last until restoring the full capacity of the drive.

Standard Charger for NI-MH Batteries

What is noteworthy this type of charging:

• Little current, respectively - the absence of a clear framework on the difference of potentials. The charge voltage can reach its maximum without any negative impact on the service life of the drive.
• Efficiency coefficient within 70%. Of course, this indicator is below the rest, and the time required for the complete reduction of the capacity increases. But at the same time the heating of the battery is reduced.

The above indicators can be attributed to the category of positive. Now you should pay attention to the negative qualities of drip charging.

• The drip recovery process does not stop even after the restoration of the total capacity. The constant impact of even small current, with full battery charge, quickly leads it to disrepair.
• It is necessary to calculate the charge time, based on such factors as the current, voltage and. Not very convenient, and some users can take too much time.

Modern nickel-metal hydride power sources are not so negatively perceived by a drip charge as older models. But manufacturers of charging devices gradually refuse to apply this battery capacity recovery.

Quick Ni-MH battery charge mode

Nominal rates of charge nickel-metal hydride batteries are:

• Current power in the range of 1 A.
• Voltage from 0.8 V.

The data from which should be repelled. For a quick charge mode, it is best to set the current strength equal to 0.75 A. This is enough to restore the drive in a short period of time and does not reduce its operational period. If you raise the current more than 1 A, then the consequence may be an emergency reset of the pressure at which the trigger valve opens.

With accurate testimony of current

In order for quick charging mode to harm the battery, it is necessary to monitor the end of the process itself. The efficiency of the rapid restoration of the container is about 90%, which is considered a very good indicator. But at the end of the process of charging the efficiency drops sharply, and the consequence of such a fall becomes not only the allocation of a large amount of heat, but also a sharp increase in pressure. Of course, such indicators negatively affect the durability of the drive.

The rapid charge process consists of several stages, which should be considered in more detail.

Confirmation of the availability of charge indicators

Process sequence:

1. The storage poles are given a pre-current, which is not more than 0.1 A.
2. Charge voltage within 1.8 V. With higher rates, fast battery charging will not begin.

Nickel-metal hydride element of medium tank

The logic circuit in the chargers is programmed to the absence of a battery. This means that if the output voltage is more than 1.8 V, the charger will take such an indicator as a lack of power supply. High potential difference also occurs when damaged battery.

Diagnostics of the power supply capacity

Before restoring the capacity, the memory must determine the level of charge of the power supply, so the rapid recovery process cannot begin if it is completely discharged and the potential difference is less than 0.8 V.

To restore the partial container of the nickel-metal hydride drive, an additional mode is provided - a preliminary charge. This is a gentle mode that allows the battery "Wake up". It is used not only after the total capacity of the capacity, but also with a debt of the storage of the battery.

It should be remembered that in order to preserve the operational period of nickel-metal hydride power sources, they cannot be completely discharged. Or, if there is no other output, then you can do it as less as possible.

What is pre-charging? Features of the process

To know how to properly charge the battery, you need to deal with the pre-charge process.

The main feature of the pre-restoration mode of the container is that it is given a certain period of time, not more than 30 minutes. The current strength is set from 0.1 a to 0.3 A. with such parameters there is no undesirable heating, and the battery can quietly "wake up." If the difference in potentials is exceeded, more than 0.8 in the pre-charge is automatically disabled and the next level of capacity recovery starts.

Variety of nickel-metal hydride products

If after 30 minutes the power supply voltage did not reach the mark at 0.8 V, this mode stops, as the charger defines the power supply as defective.

Fast battery charge

This stage is the very, fast charge of the power supply. It proceeds with the mandatory observance of several basic parameters:

• Control over the current, which should be within 0.5-1 A.
• Control over time indicators.
• Permanent comparison of the difference of potentials. Disable the recovery process if this indicator falls 30 mV.

It is very important to monitor the change in voltage parameters, since at the end of a quick charging battery begins to get warm quickly. Therefore, the memory includes individual nodes responsible for controlling the power supply voltage. This specifically uses the control method on the voltage delta. But some manufacturers include modern developments that turn off the device with a long lack of any changes in the difference in potentials.

A more expensive option is to install a kotroller for a change in temperature. For example, with an increase in the temperature of the Ni-MH of the drive, the speed recovery mode of the container is automatically shut off. For this, it is necessary for expensive temperature sensors or radio-electronic schemes, respectively, the price and the charger itself increases.

Dosage

This stage is very similar to the pre-charging of the battery, in which the current is set in the range of 0.1-0.3 A, and the entire process takes no more than 30 minutes. Processing is necessary, since it allows you to align electronic charges in the power source, and increase its operational period. But with a longer recovery, on the contrary, the battery destruction is accelerated.

Features of super-fast charging

There is another important concept of restoring the capacity of Ni-MH batteries - a superpust charge. Which not only quickly restores the power supply, but also prolongs its operational period. This is connected with one interesting feature of Ni-Mh batteries.

Metal hydride power supplies can be charged with increased currents, but only to achieve 70% of the tank. If you skip this moment, then the oversized current parameter will only lead to the rapid damage of the battery. Unfortunately, the manufacturers of memory consider the installation of such controlling nodes to their products too costly, and use a simpler fast charging.

Comfortable finger power supplies

To carry out a super-fast charging follows only on new batteries. Increased currents lead to rapid heating, the next stage of which the pressure shut-off valve becomes the opening valve. After opening the shut-off valve, the nickel battery is not subject to recovery.

Choose a charger for Ni-MH batteries

Some manufacturers of the memory make a bias towards products made specifically for the charge of Ni-MH batteries. And this is understandable, since the data sources of the highest amount in many electronic devices.

It should be considered in more detail the functionality of the charging devices created specifically to restore the capacity of nickel-metal hydride batteries.

• Mandatory presence of several protective functions that are formed by a certain combination of some radio elements.
• The presence of a manual or automatic current force adjustment mode. Only in this way can be installed different steps of charging. The potential difference is usually taken constant.
• Automatic recharging of the battery, even to achieve one hundred percent tank. This allows you to constantly maintain the basic parameters of the power source, not to the detriment of the operational period.
• Recognition of current sources operating in a different principle. Very important parameter, since some varieties of batteries, with too much charge current can explode.

The latter function also refers to the discharge of special and requires the installation of a special algorithm. Therefore, many manufacturers prefer to abandon her.

Ni-MH Power sources are widely popular due to their durability, ease of operation, as well as affordable prices. Many users managed to estimate the positive qualities of these products.

NIMH batteries - power supplies that are classified as an alkaline battery. They are similar to nickel-hydrogen batteries. But the level of their energy container is greater.

The internal composition of Ni MH batteries is similar to the composition of nickel-cadmium power supply. To prepare the positive output, this chemical element, nickel, minus - alloy, which includes hydrogen absorbing hydrogen metals.

Several typical designs of nickel metal hydride acb:

• Cylinder. To divide conductive conclusions, a separator is used to which the cylinder shape is specified. An emergency valve is concentrated on the lid, which is opened with a substantial increase in pressure.
• Prism. In such a nickel metal hydride battery, the electrodes are concentrated alternately. Separator applied for their separation. To accommodate the main elements, a housing prepared from plastic or a special alloy is used. To control the pressure into the composition of the cover, the valve is introduced or the sensor.

Among the advantages of such a power source are distinguished:

• Specific energy parameters of the power supply increase during operation.
• When preparing conductive elements, cadmium is not used. Therefore, problems with the utilization of the battery does not occur.
• The lack of a kind of "memory effect". Therefore, there is no need to increase the container.
• In order to cope with the discharge voltage (reduce it), experts perform the discharge of the unit to 1 1-2 times a month.

Among the limitations that are related to nickel-nickel hydhydride batteries are distinguished:

• Compliance with the installed interval of working currents. The excess of these indicators leads to a rapid discharge.
• Operation The power source of this type into severe frosts is not allowed.
• The composition of the battery is introduced thermal fuses, which determine the overheating of the unit, increase the temperature level to the critical indicator.
• Template to a self-disconstruction.

Charging Battery Nickel Metal Hydride

The process of charging nickel metal hydride batteries is associated with certain chemical reactions. For their normal flow, part of the energy is required, which is supplied by the charger, from the network.

The efficiency of the charging process is a part of the energy-produced power source that is intensified. The magnitude of this indicator may be varied. But at the same time get 100 percent efficiency is impossible.

Before charging metalhydride batteries, study the basic species that depend on the current value.

Drip charging type

Apply this type of charging for batteries must be carefully because it leads to a decrease in the operation period. Since the disconnection of the charger of this type is carried out manually, the process needs constant control, regulation. In this case, the minimum current indicator (0.1 of the total capacity) is set.

Since with such a charge Ni MH batteries, the maximum voltage is not installed, oriented only on a temporary indicator. To estimate the time gap use the parameters of the container that has a discharged power source.

The efficiency of the power supply charged in this way is about 65-70 percent. Therefore, manufacturers are not advised to use such chargers as they influence the operational parameters of the battery.

Fast recharging

Determining how Ni MH batteries can be charged in fast mode, manufacturers recommendations are taken into account. Current value - from 0.75 to 1 from a total capacity. The set interval is not recommended to exceed, since the emergency valves are turned on.

To charge NIMH batteries in fast mode, voltage is installed from 0.8 to 8 volts.

The efficiency of rapid charging NI MH power sources reaches 90 percent. But this parameter decreases as soon as charging time ends. If you do not turn off the charger in a timely manner, then the pressure will increase inside the battery, the temperature indicator will increase.

In order to charge Ni MH Akb, perform such actions:

• Pre-charging

This mode is introduced if the battery is completely discharged. At this stage, the current is from 0.1 to 0.3 from the tank. It is prohibited to use big currents. The time interval is about half an hour. As soon as the voltage parameter reaches 0.8 volts, the process stops.

• Transition to accelerated mode

The process of current extension is carried out for 3-5 minutes. During the entire time gap, the temperature is controlled. If this parameter reaches a critical value, the charger is turned off.

With a quick charge of nickel, metalhydride batteries current is set at 1 from a total capacity. It is very important to quickly disable the charging device, in order not to harm the battery.

To control the voltage use a multimeter or voltmeter. This contributes to the exception of false positives that adversely affect the performance of the device.

Part of the chargers for Ni MH batteries are not working at constant, but when pulsed current. Current supply is carried out with a set periodicity. Pulse current supply contributes to the uniform distribution of electrolytic composition, active substances.

• Additional and supporting charging

To replenish the total charge Ni MH of the battery at the last stage, the current indicator is reduced to 0.3 from the tank. Duration - about 25-30 minutes. Increase this time interval is prohibited, because it contributes to minimizing the operation period of the AKB.

Accelerated charging

Some models of the nickel cadmium batteries are equipped with an accelerated charging mode. To do this, charging current is limited by setting parameters at 9-10 from the tank. Reduced charge current is necessary as soon as the battery will be charged to 70 percent.

If the battery is charged in accelerated mode more than half an hour, the structure of the conductive conclusions is gradually collapsed. Experts recommend using such charging if you have certain experience.

How to charge power supplies, and also eliminate the probability of recharging? To do this, comply with such rules:

1. Monitoring the temperature mode Ni MH batteries. It is necessary to stop charging NIMH batteries, as soon as the temperature level is rapidly rising.
2. For NIMH power sources, temporary restrictions are installed that allow you to control the process.
3. Drop Ni MH batteries and charge them at a voltage, which is 0.98. If this parameter is significantly reduced, the charges are shutdown.

Restoration of nickel metalhydride power supplies

The recovery process of Ni MH batteries is to eliminate the consequences of the "memory effect" that are associated with loss of tank. The likelihood of such an effect increases if it is often incompletely charging the unit. The device is fixed by the lower boundary, after which the container is reduced.

Before restoring the power supply, such items are prepared:

• Light bulb required power.
• Charger. Before applying, it is important to clarify whether to use a charger to discharge.
• Voltmeter or multimeter to establish voltage.

A light bulb or a charger, which is equipped with the appropriate mode, is added to the battery with their own hands, in order to fully discharge it. After that, charging mode is activated. The number of recovery cycles depends on how long the battery was not operated. The workout process is recommended to repeat 1-2 times within a month. By the way, we restore in this way those sources that have lost 5-10 percent of the total capacity.

To calculate the lost container use a fairly simple method. Thus, the battery is fully charged, after which it is discharged and the container is measured.

This process is essentially simplified if you use the charger with which the voltage level can be monitored. Such aggregates are beneficial to use also because the probability of deep discharge is reduced.

If the degree of charge of nickel metalhydride batteries is not installed, then it is necessary to bring the light bulb. Using the multimeter, the voltage level is controlled. Only it is so prevented by the probability of a complete discharge.

Experienced specialists are carried out as the restoration of one element and a whole block. In the charging period, there is an alignment of the existing charge.

Restoring the power supply, which was operated for 2-3 years, with full charge, discharge does not always bring the expected result. All because the electrolytic composition and conductive conclusions gradually change. Before applying such devices, the electrolytic composition is restored.

View video about restoring such a battery.

Rules of use of nickel-metal hydride batteries

The duration of operation of NI MH batteries depends largely on whether overheating is not allowed or a substantial reload of the power supply. Additionally, the masters advised to consider the following rules:

• Regardless of how much power supplies will be stored, they must be charged. The charge percentage should be at least 50 of the total capacity. Only in this case there will be no problems during storage and maintenance.
• Rechargeable batteries of this type are sensitive to recharging, to excessive heating. These indicators affect the duration of use, the magnitude of the current. Special chargers are required for these power sources.
• Conduct training cycles for nickel-metal hydride power sources optional. Using a proven charger, the lost container is restored. The number of recovery cycles largely depends on what state the unit.
• Between the recovery cycles necessarily take breaks, and also study how to charge the battery is operated. This time interval is required in order to the unit cooled, the temperature level dropped to the desired indicator.
• The procedure of recharging or training cycle is carried out only in an acceptable temperature mode: + 5- + 50 degrees. If you exceed this indicator, the probability of the rapid failure increases.
• When charging, the voltage does not fall lower than 0.9 volts. After all, some chargers do not charge if this value is minimal. In such cases, it is allowed to lift the external source for power recovery.
• Cyclic recovery is carried out, provided that there is a certain experience. After all, not all chargers can be used to discharge the battery.
• The storage procedure includes a number of simple rules. It is not allowed to keep the power supply in the outdoor or indoors in which the temperature level is reduced to 0 degrees. It provokes the frozen of the electrolytic composition.

If there is not one, but several power sources is carried out at a time, then the degree of charge is maintained at the established level. Therefore, inexperienced consumers carry out the restoration of the AKB separately.

NiMH batteries are effective power supplies that are actively used to complete various devices and aggregates. They stand out by certain advantages, features. Before their operation is required to account for basic use rules.

Video Pro NimH Batteries

Introducing the widespread distribution of lithium-ion batteries in small-sized devices - players, mobile phones, expensive wireless mice - the usual Batars of AA format are not going to take positions. They are cheap, you can buy them in any kiosk, finally, making meals from standard batteries, the manufacturer of the device can shift the concern about their change (or in the case of batteries, charging) to the user and thereby save a few more dollars.

AA format batteries are used in most inexpensive wireless mice, in almost all wireless keyboards, in remote controls, in low-cost "soap boxes" and expensive professional photos, in lanterns and children's toys ... In general, you can list long.

And more and more often, these batteries are replaced with batteries, as a rule - nickel-metal hydride, having a passport capacity from 2500 to 2700 mA * h and operating voltage 1.2 V. Identical with batteries The dimensions and close voltage can easily install them in almost any device without any problems, originally designed for batteries. The benefit is obvious: just one battery withstands several hundreds of recharge cycles, so also the capacity of it at least some serious load turns out significantly higher than the batteries. So, you will not only save money, but also get a more "long-playing" device.

In today's article, we will look at - and check in practice - 16 batteries of different manufacturers and with different parameters to determine what of which you should buy. In particular, they will not be ignored and not so long ago that have been on sale batteries with a reduced self-discharge current, capable of lying in the charged state - and stay ready for use at any per minute.

We will remind our readers that the device and basic features of various types of batteries, as well as the selection of chargers for Ni-MH batteries we already described earlier.

Testing technique

A detailed description of the technique can be found in a separate article, the entirely dedicated to this topic: "".

If you speak briefly, for testing the batteries, we use the Sanyo MQR-02 charger (four independent charge channels, current 565 mA), a four-channel stabilized load of its own manufacturer, which allows you to test four batteries at the same time, and the Velleman PCS10 recorder, which is built with which is built Schedule of voltage in batteries from time.

All batteries before testing are trained - two full cycle charge-discharge. Measuring the battery capacity starts immediately after charging - with the exception of the dough on the self-discharge current, before which the batteries are kept for a week at room temperature without load. In most tests, each model is represented by two instances, but in some cases - on GP and Philips batteries that showed unexpectedly bad results - we re-check the measurements on four batteries. However, there were no serious discrepancies between different instances in any of the tests.

Since the voltage curves in most batteries are similar - the exception in today's article has become only Nexcell products - we present the measurement results only in amperes (a * h). The transfer of them to the watt-hours for the specified reason for the alignment of the forces will not affect.

ANSMANN ENERGY DIGITAL (2700 MA * H)

Opens our article by the brand of batteries, not very common in stores, but at the same time the well-known and well-known reputation among photographers.

Nevertheless, Ansmann batteries were not more than average - in general, they did not rise in any of the tests even until the middle of the final table. The backlog from the leaders in the container was about 15-20%. However, there were no other problems with them.

ANSMANN ENERGY DIGITAL (2850 MA * H)

The more capacious version of the previous batteries, outwardly, at first glance, differing only in the inscription on the case.

However, with attentive consideration differences turned out to be more substantial:

As you can see in the photo, the housing of the older model is a bit larger than the youngest, and the advantage is made, on the contrary, in short, to keep the common battery size unchanged. Unfortunately, in some devices in which the positive contact in the battery compartment is drowned (in order to prevent random battery cakes), ANSMANN ENERGY DIGITAL 2850 may simply not earn - they will disappear into the device housing and simply will not get to its positive contact. By the way, one of these devices was our test stand: to test these batteries, we had to put the metal plates under the plus contact.
But is it worth the heater of the dressing? .. According to the test results, the batteries of ANSMANN DIGITAL ENERGY 2850, although he was ahead of the younger model of the same company, but in general, the end of the fourth place could not climb, and the fourth, and the fourth occupied in a rather specific test.

ANSMANN ENERGY MAX-E (2100 MA * H)

A relatively small capacity of these batteries is due to the fact that they relate to the new class of nutrition elements - Ni-MH batteries with a reduced self-discharge current. As is known, in conventional batteries during storage, the capacity smoothly decreases, so, after going for several months, they are discharged to zero. Max-e must keep charge for much more time, that is, months, and even years old - it allows, firstly, to effectively use them in devices with small power consumption (for example, hours, remote controls and so on), Secondly, if necessary, use immediately after purchase, without prior charging.

Externally, batteries are quite ordinary. Dimensions - standard, compatibility problems with any devices they will not.
We added another one to the usual test set: the discharge of the battery with a current of 500 mA without prior charging. It is difficult to say how much time they got from the manufacturer to the store, and then lay in the store before they bought them - but the result is obvious: just purchased accumulators had a residual capacity of about 1.5 a * h. Conventional batteries such a test simply did not pass: without pre-charging, their capacitance turned out to be close to zero.

Camelion High Energy NH-AA2600 (2500 MA * H)

No, the title is not a typo: despite the number "2600" in the title, in fact, the passport model capacity of these batteries is 2500 mA * h.

On the housing of the batteries, this is indicated by direct text - the truth is very small font.
Moreover, in most tests, Camelion batteries confidently occupied the last place, demonstrating a real capacity of less than 2000 ma * h (we tested two Camelion batteries at the same time - the result was the same). There is nothing unusual on the discharge curves - they look smoothly as graphics should look like a battery with a capacity of 2000 ma * h. Attempts with a magnifying glass found on the label is even more small font explaining the result resulting, the success was not crowned.

Duracell (2650 mA * h)

The Duracell brand on the market of nutrition elements is known perfectly - it is unlikely that it will be easy to find a person who would not hear about it. However, judging by the design of the batteries, Duracell makes them not himself - they are extremely similar to Sanyo products.

Result Duracell batteries have shown not bad: Despite not the highest passport capacity, in one case they could even get to the top three leaders.

Energizer (2650 mA * h)

Exactly the same design, and even the design of the label in something looks like - before us again batteries manufactured by Sanyo, but this time sold under the brand name Energizer.

The result was amazing: despite participation in testing batteries with a passport capacity up to 2850 mA * h, Energizer batteries with them, it would seem modest 2650 ma * h in two load tests from three, took the first place!

GP "2700 series" 270aahc (2600 mA * h)

Another "not typo" in the title: Despite the two-time hint on the capacity of 2700 mA * h, in fact, GP 270aAHC batteries have a passportable capacity of 2600 mA * h.

As usual, this is written about small font - slightly lower than the large, almost into the entire body, the number "2700".
The result in the general test was small: the eighth place in tests with a large load and only the penultimate, with a container, barely exceeding 2000 ma * h, - with a load of 500 mA.

GP Recyko + 210aAHCB (2050 mA * h)

Recyko + is another series of batteries with a small current self-discharge, ready to use immediately after purchase and suitable for work in devices with small power consumption.

The passport capacity of the battery differs from the one specified in its name ("210aAHCB") by 50 ma * h to a smaller side.
The promised decrease in the self-discharging current in the tests was confirmed: new, only from the store, the battery was able to give about 1.7 a * h without prior charging. We will remind readers that several of the "ordinary" batteries trying to us in such conditions were not able to give anything at all, immediately "osquita" under load to zero.

Nexcell (2300 mA * h)

Products not too well-known company Nexcell attracts their low price: four pieces package costs less than two hundred rubles.

Formally no privificues: the value of 2300 mA * h is directly indicated as a typical passport capacity of batteries.
Alas, in reality, the picture is sad. In all cases, Nexcell accumulators were in the last three, and in the most severe test, with a constant load of 2.5 A, and in the last place, and with a catastrophic lag at all: compared with the load of 500 mA, the battery capacity "wishhed" more than twice . In this case, other batteries, the capacity from the load depended very weakly.

It is simply explained: Nexcell accumulators have a very large internal resistance. Look at the pulse discharge schedule: the upper limit of the strip on it corresponds to the voltage without load, the lower - with a load of 2.5 A., respectively, the line width is equal to the drop in the battery voltage under load, which is determined by its internal resistance - and if the remaining batteries drops around 0.1 V, then Nexcell is twice as much. Because of this, with a large load, the voltage on the battery is strongly seated, and as a result, it turns out to be lower than the maximum permissible value of 0.9 V.

So, although under the average load (500 mA), Nexcell batteries performed more or less acceptable, with more serious currents they will not work at all, or will be very lost in the containers. And let's say, for photo posts, such characteristics of batteries will mean a significant time of charging a high-voltage capacitor.

Nexcell (2600 mA * h)

The next model of Nexcell batteries is a capacity of 2600 mA * h and the price of 220 rubles in four pieces.

There are no external differences, but will the test results differ? ..
The patient's condition, as doctors say, is stable heavy: in all tests - places at the end of the tournament table. The result is not so catastrophic, like a model by 2300 mA * h, but the problem with the overestimated twice inner resistance is not doing anywhere: under a large load, the battery will noticeably "sends."

Generally speaking, the Nexcell accumulators are now on sale. 2700 mA * h, however, once again looking at the results of the two models described above, we decided not to spend time on their testing. As cheap batteries for devices with relatively low power consumption, the Nexcell products will suit, but it is not worth it for something more serious.

Philips Multilife (2600 mA * h)

Philips batteries were able to surprise us right away - unfortunately, in a negative key. They have the same disadvantage that the Ansmann Energy Digital 2850 considered above: increased enabarits of the case, which is why they simply do not get to the positive contact in some devices. And if in the case of ANSMANN, it was possible to at least refer to a large passport capacity, then for Philips batteries, a rather modest 2600 mA * h.

At the same time, Philips batteries in tests have not been shown any success, in load tests steadily occupying space in the middle of the list. Any reson in the purchase of Multilife, therefore, find it difficult: the average capacity and potential compatibility issues due to increased envelope housing.

Philips Multilife (2700 mA * h)

The new version of Multilife batteries per 100 mA * h increased the passport capacity, but at the same time preserved non-standard enabarits of the case - and, accordingly, potential compatibility issues.

Interestingly, on both series of batteries MULTILIFE, the same minimum capacity is 2500 mA * h. In other words, not only a typical passport capacity, but also the variation of the parameters between different instances.
However, in all the tests of Philips Multilife 2700 mA * h showed the best result than their 2600-ma * h collections in the series, and with a load of 500 mA, they could even get out of the third place. Although the final verdict does not change from this: non-standard dimensions can lead to incompatibility with specific devices, so that it is better to refrain from buying these batteries.

Sanyo HR-3U (2700 mA * h)

Sanyo is one of the largest battery manufacturers, and above, we have already tested its products selling under the brands of Duracell and Energizer. However, there were batteries with a passport capacity of 2650 mA * h, now we keep the model for 2700 mA * h. What is it, just rounding the number - or another battery?

The dimensions of Sanyo HR-3U has completely standard that after Philips batteries pleasantly pleased - it is not necessary to put metal plates more more to ensure the reliable contact of the battery with the load in our test installation.

Please note that with a typical passport capacity of 2700 mA * h, the minimum can be 200 mA * h below - due to the variation of the parameters between different instances.
It is interesting, but in load tests with large currents of Sanyo 2700 ma * h significantly lagging behind the batteries of Energizer and Duracell with a capacity of 2650 ma * h, in fact, produced by the same Sanyo, - but on the current 500 mA, all three showed the same results.

VARTA POWER ACCU (2700 MA * H)

Varta is a very well-deserved and well-known manufacturer of nutrition elements, which, unfortunately, is rarely found on sale in Russian stores. However, we were lucky, and we could buy three models of Varta batteries.

VARTA POWER ACCU have a passport capacity of 2700 mA * h and, as the label assures us, are designed for a quick charge (under that, it is necessary to believe, a 15-minute charge is understood by a big current - the way is not the best, but convenient if you need to get ready enough To use batteries). The design of the positive contact cover is rather unusual - the batteries of other firms it looks much easier. However, no technical difference is no, in any case, there are holes near the contact for resetting excess internal pressure during incorrect battery charging.
In two load tests, Varta Power Accu batteries occupied the honorable second place, the aback from Energizer batteries literally by 10 ma * h - it is less measurement error. In the third, at a current of 500 mA, they became the first at all.

VARTA PROFESSIONAL (2700 MA * H)

With the same passport capacity, the name of the next series of Varta batteries hints that they should be better than the "simple" Power ACCU.

External differences, however, are reduced to different labels.
The results are somewhat discouraged: in all the tests of Varta Professional, though have demonstrated a good result, but from Power Accu a little behind. The difference is small, so in principle these series can be considered identical in real characteristics.

VARTA READY2USE (2100 MA * H)

We are completed by our testing more "long-livers" - batteries with a reduced self-discharge current, this time the production of Varta.

The result of them, however, differs little from two similar models discussed above - GP Recyko + and ANSMANN MAX-E. Larction of containers between these three models is small, and each of them ranked first each time - in three load tests.

Without prior charging - immediately after purchase - ready2use was able to pay a little more than 1.6 a * h on a load of 500 mA, thereby confirming what is really ready for use.

Load tests

Having considered the batteries separately, let us summarize the results of measurements in diagrams - it is easier to understand the balance of strength among specific participants, and various general trends. In all diagrams, three models with a reduced self-discharge will be highlighted in a separate group.

The most, perhaps, actual from a practical point of view: The load is 500 mA, in order of magnitude corresponding to many devices in which the batteries are used - lanterns, children's toys, cameras ...

In the leaders, two Varta batteries, there are four models behind them a dense group, three of which are produced by Sanyo. ANSMANN batteries, despite the largest passport power among the models represented, not visible success. Absolute Outsider - Camelion Battery, immediately in front of it are GP, Nexcell and the younger model ANSMANN.

All three batteries with a reduced self-discharge rather close to each other: the difference between them is less than five percent.

It should be noted that no model showed a passport capacity, but of this in general, it should not be deceived by all manufacturers: the measured container to some extent depends on the conditions in which these measurements were made.

With a large load current - 2.5 A - Energizer batteries (Sanyo) are published, with a minimum margin behind them is Varta, and the triple is closed again, but already under the Duracell label. At the same time, what is interesting, the "native" Sanyo batteries at 2700 mA * h rather markedly behind the leaders.

GP batteries were able to partly restore their reputation, closer to the middle of the list. Camelion once again confirmed that their real capacity is quite far from the promised 2500 mA * h (note that with an increase in current 5 times, from 500 to 2500 mA, their result has changed weakly - this indicates the absence of any serious internal problems In other words, the batteries are good ... just they are not the container that is indicated on the label). Both Nexcell models also "seen" due to very high internal resistance - this is just an internal problem of the battery, and means that for large loads it is not intended at all.

Low self-discharge batteries again show close results, and, compared with the 500-mA test, the leader and outsider changed in places. But, repeat, the difference between them is small, and you can close your eyes.

Pulsed discharge - at which there is 6 seconds for recovery for recovery between 2,25-second current pulses with an amplitude of 2.5 and batteries. In the leads again, Varta and Energizer, Ansmann rose to the fourth place. Some surprise and upset the results of Sanyo HR-3U, the products of Nexcell and Camelion took the usual recent places.

Interestingly, such a discharge mode as a whole was for batteries the most light: the results compared to previous tests were gradually, some models even exceeded their passport capacitance.

Self-discharge of batteries for 1 week

Considering above the model with a reduced self-discharge current, which can be able to lie without months, almost without losing the tank, we have already mentioned that they were all ready for use immediately after unpacking, without preliminary charging - with a passport capacity of about 2 a * h in such a situation, they gave 1.5-1.7 a * h. It is obvious that manufacturers' statements are not an empty sound, such batteries like ANSMANN MAX-E, GP Recyko + and Varta Ready2use can really be stored for months in a charged state, as well as used in devices with small power consumption.

For the sake of the purity of the experiment, we also tried to load a current of 500 mA several freshly "ordinary" Ni-MH batteries with passport containers 2600-2700 mA * h. The result was expected: without prior recharge, they cannot work, under any noticeable load, the voltage is almost instantly dropped below 1 V.

However, at what time storage time will the difference between different types of batteries begin to feel? After all, the three above-mentioned models have not only a smaller self-discharge current, but also a smaller passport capacity.

To find out this, we have withstood charged batteries during the week, after which they measured their capacity under the load of 500 mA - and compared with the capacity immediately after charging.

In percentage calculus, the first two places were taken by models with a small self-discharge, and only ANSMANN MAX-E led by losing 10% of the tank. Approximately half of the "ordinary" batteries lost from 7 to 10% of the tank, the Philips Multilife 2600 batteries were unexpectedly well, who lost more than a quarter of charge. GP batteries unsuccessfully.

Please note that in two cases, more capacious batteries demonstrated and large losses: it is ansmann energy digital and nexcell.

In other words, if immediately after charging ANSMANN, 2850 mA * h has a really big capacity than ANSmann by 2700 mA * h, then a few days later the situation is no longer so unequivocal. Let's look at the table with battery tanks in a week of excerpts:

All leading positions are tightly occupied by Varta models (first two places) and Sanyo (places from the third fifth) - here, in general, even nothing to discuss, the success of these companies is absolutely obvious.

But between pairs of batteries of one manufacturer, but the situation of different capacles has developed interesting. Philips 2700 was able to bypass the Philips 2600, but it is not surprising - considering how much the failed result has shown the latter, overtaking at the current of the self-discharge of everyone and everything. But in the Ansmann 2700/2850 and Nexcell 2300/2600 pairs after weekly rest, models with a smaller passport capacity took place.

Separately, it is worth noting that in one week, the accumulators with a reduced current of the self-discharge of any decisive advantage did not demonstrate, they should be navigable if you need a significantly larger interval between recharging.

Conclusion

Well, it's time to summarize and give recommendations. First, go through the manufacturers ...

Of course, testing leaders among models with a capacity of 2500 mA * h and above were Varta and Sanyo batteries (including those sold under the Energizer and Duracell stamps, as well as some others - for example, Sony). No one could compete in the top three with them in the frequency of getting into the first three with them, and in the test for a weekly self-discharge, they solely occupied the first five places.

The senior battery models ANSMANN ENERGY DIGITAL (2850 MA * H) and PHILIPS MULTILIFE (2700 MA * H) were mainly kept in the middle, one after one time I walked out the third place. And it would be possible to call them mid-nurses, in principle, not much lagging behind the leaders and their money, if it were not for one "but" - enlarged enabarits of the corps. Because of this, these models may be simply incompatible with some devices, and therefore we advise not to risk and pay attention to other batteries.

Pretty bad batteries GP. It is not enough that their manufacturer introduces customer buyers with marking (a typical passport capacity of the "2700" series - not 2700, as it would be possible to think, and 2600 mA * h) and real results are not impressive: low capacity and high self-discharge current.

In the case of Camelion, there is not enough that the large inscription "2600" does not correspond to their passport capacity (equal to 2500 mA * h), so in practice they are extremely extremely reminiscent of batteries with a capacity of about 2000 ma * h. They have a small self-discharge current, small internal resistance, but, buying these batteries, you need to remember - they do not have any relationship to 2500 mA.

Nexcell products - the only one who demonstrated in our tests the presence of fundamental problems, and not just unfair marking. These batteries internal resistance are twice as high as all other tested models, and therefore with a large load they coped out of the hands badly.

And finally, three models of accumulators with low self-discharge - Varta Ready2use, GP Recyko + and Ansmann Max-E - made approximately on a par. Yes, they really can be used immediately after purchase, without prior charging.

What to navigate in general, choosing batteries? Let's give some tips:

The real capacity of batteries, as shown by our measurements, is stronger dependent on their manufacturer than from the figures on the label - Sanyo (2650 mA * h) and Varta (2700 mA * h) confidently overtook ANSmann (2850 mA * h).
Do not chase for a large passport capacity. Batteries with a greater tank often have a high self-discharge current, which means that if you use them not immediately after charging, but for several days, the batteries with a smaller passport capacity may be more efficient.
When buying, pay attention to the dimensions of the battery. Three of the models tested are two Philips batteries and one ANSMANN - had increased envelpirates of the case, which did not work in all devices.
In advance, however intense you will use batteries. If you plan to charge them at least once a week - then it is worth paying for models with a passport capacity of about 2700 mA * h. If the batteries should have long (significantly longer than a week) charged "just in case" or used in devices with low consumption, for example, remote control or hours, then preference should be given models with a reduced self-discharge current, despite their smaller passport capacitance.

P.S. Some words about what is on the basis of which choose between batteries and ordinary disposable batteries, you can read in our previous article.

Other materials on this topic

Testing AA Format Batteries
Battery and Battery Testing Method