How to better check the car battery for performance: choose the appropriate way. How to check the car battery in the garage conditions? How to check battery charge multimeter home

Content:

Rechargeable batteries (in reducing AKB) as sources of electrical energy need periodic testing. The simplest test can be the use of a battery for its intended purpose. For example, in a flashlight on the brightness of the lamp luminescence or in the engine of the energity of the starter spinning. But this assessment of the status of the battery is very approximate. Especially for the car battery. After all, the design itself is the design of this electrical appliance. Battery varieties There are several. Their main difference in the aggregate state of the components.

Car battery, like some other similar devices, contains liquid electrolyte. Its status is checked by a special method of appropriate appliances. But electrical characteristics Battery, both in a car, and in any other case, can be checked using a multimeter. Therefore, further in the article will focus in more detail on how to check the battery multimeter. It is also often referred to as the tester, applying this name mainly to the instruments with the arrow scoreboard.

What is checked in the battery

Any battery, regardless of its design, is estimated by three main indicators:

• the ability for a certain time maintain a given level of electrical power, which is called the battery capacity;
• the value of the current for which such amperezh does not cause a breakdown in this source of electricity;
• voltage in a fully charged state.

The battery voltage that does not supply the load is the maximum largest. It always decreases either as it discharges, or depending on the strength of the battery current, even if it is fully charged, but it feeds one or another load. The current strength in the electrical circuit of the charged battery determines not only the load, but also its internal resistance. It basically also characterizes the battery as a source of electricity. What it is less, the greater the electrical power of the battery.

Checking the battery charging multimeter comes down to voltage measurements and current. On the battery of any design, you can measure the tension by this device. But to evaluate the battery charge by a multimeter, measure in chains charger Charging current power. If its value decreases, it means that a certain charging process occurs. But you should specify what to check the voltage and charging current - it means simply to find out, "alive" the electrical appliance or "dead". That is, whether the battery can be used as at least a poor source of electricity.

Check under load

Full check The battery is always done with load current measurements. For example, to check the car battery, you need a load designed for currents in dozens of amps. Such an electrical structure is called a load fork. Before checking the multimeter, a car or other powerful battery, you need to take care that such a plug is in stock. It can be included with the tester. It can be bought in the store. Well, in the extreme case, such a design can be made with your own hands.

Fork in its essence is a resistor with a parallel attached voltmeter. It allows you to measure the voltage on the terminals of the battery loaded by this resistor. But since it is attached to a relatively long time, in order for the operator to determine the battery capacity, the resistor has time to warm up and needs cooling. Hence such a bulky design. But the container is measured in this way, the capacity is quite accurate. Let us explain in more detail how to measure its value. This explanation will also give the answer to the question how to check the battery charge.

Immediately make important clarification. Between the measured battery charge and the term "capacity" applied to it, no equality sign can be. Simply these words are used on the household level for convenience as synonyms. But the essence of the battery capacity consists in changing the time of the current value. And the concept of charge is static, that is, means some kind of final value when the charging process is completed. The most visible indicator of the energy potential of the battery is the voltage on its terminals.

Procedure

Before you know how voltage on them, we recommend checking car battery Complex, and not just a multimeter. Such a check should be made periodically, especially before charging it. So, let's begin.

• We look at the case from all sides to reveal the cracks in it.
• Check the cleanliness of the surface with terminals. The worst of all is the electrolyte sweels on it. They create additional discharge chains, which slowly, but correctly reduce the energy intensity through the self-discharge of the battery. It is easy to make sure that by applying one probe multimeter to one of the terminals, and by another probe touched the body in different places of the electrolyte spot. The device is set to voltage measurement mode.

If you translate the device into current measurement mode, you can get an idea of \u200b\u200bthe values \u200b\u200bof leakage currents. Spilled electrolyte must be removed from the surface.

• Open traffic jams and measure the level of electrolyte, gaining it with a leveling tube (immersed up to the stop). If necessary, plot distilled water so that the level in the tube corresponds to the norm.

• Ariometer measuring electrolyte density.

The final check will be measured by the multimeter of the electrical parameters of the battery. Stress out the terminals already testifies to the state of the battery.

• Multimeter readings We specify the load fork (without disconnecting the multimeter probe for more accurate measurement). It is attached to the terminals for five seconds and fix the voltage by 5-6 seconds by the Multimeter scoreboard. The countdown is enough to do at times, two, three, four, five without any stopwatch.

Specially selected load plug resistance ensures the correct load, which, accordingly, the current standards, slightly discharge the battery. The plug resistance is 0.1 Ohm, which is mentioned in its technical passport and can also be indicated on the package. Therefore, when independent manufacture Loads made of powerful resistors need to be obtained precisely such a magnitude of their overall resistance.

Correct and timely measurements will make the most use of the design capabilities of the battery.

In conclusion, everything important parameters Show together in one image.

All articles

One of important elements Auto requiring verification is a battery, or AKB. The serviceability of the battery and its performance is very important, since it is thanks to batteries that the car will be used, and the electricity systems are powered by all systems: the headlights of the Middle and far Light, media system and much more.

If you have already met with the seller and want to be sure that in the case of buying a car you will not have to be the first thing to break the head to run to the store for the new Akb, the cost of which is usually more than 10 thousand rubles, then you have several ways to check the battery By car:

• Inspect the battery outwardly;
• Measure the voltage on the battery multimeter;
• Check the battery with a load fork;
• Check the electrolyte level in the battery.

Every question we will consider in detail, but we immediately note that the fourth version with checking the level of electrolyte is available only for serviced batteries. But anyway, there are a number of methods, how to check the car battery for performance, and in this article we will look at them.

You met with the seller and have already walked around a car in a circle, saw what it was clean and beautiful. It's time to look under the hood, you raise the lid and see the usual content of the windscarette, the engine and numerous systems that support the operation of the car.

In most cases here, in open space, It is also ankb - a rectangular box with an electrolyte inside, to which two wires are suitable - the positive and minus. These wires go to the distributor block, and the entire machine and all its systems feeds from this electrolyte massive "battery" of electricity.

Even if you do not understand anything in cars and went on an independent inspection rather as part of compliance with the formality, you can still appearance Akb determine what state it is.

With external inspection, attention should be paid to the most part of the integrity of the elements, and the battery and contacts are clean. There are a number of external factors, the presence of which immediately reports replacement Or at least cleaning the battery.

• Dirt on contacts. In order for the battery to work, both contacts suitable for its wiring must be clean. In case the contacts are dirty, it suggests that the battery is not new, and the dirt will interfere with the correct operation of contacts.
• The oxidation of the conclusions - the unarmed eye can be seen on the terminals of the battery, the extraneous tax is oxidation, which in most cases is associated with the leakage of the electrolyte. The electrolyte is an acid that is inside the battery. If it is spilled and falls into contacts, it may lead to a deterioration in the battery life and a decrease in contact area.
• Cracks on the housing - the battery itself should be integer. Plastic box containing electrolyte should not be damaged. This is also clearly visible without additional equipment and with good lighting.
• Dirt, dust, elevation of electrolyte - all this is eliminated by a rag, and you can not allow the car to go with a dirty battery, since the conductive tax will contribute to its quick discharge and deterioration of work.

In addition to external inspection, you can run the car engine. Especially indicative will be the launch of "on the cold" if the engine did not start for a long time, but on the street, cold. If the car started easily - the battery is in order, if she did not start or started hard, the headlights shine dimly, and dashboard Also not brightly highlighted, the battery should be changed. Or, at least, check it with appliances, which we will tell me further.

Voltage measurement multimeter

If you do not want to check the state of the battery "on the eye", or simply want to have accurate results in the hands in numerical expression, you will need such a device as a multimeter.

So, how to check the car battery by multimeter: the device itself has two probe, one of which is red, and the other is black. In order to measure the battery voltage, you need to translate the multimeter to the measurement mode and lean the red probe to the "positive" conclusion, and the black dipstick, respectively, to the "minus".

The procedure is carried out at the outputs of the battery without load. In the event that the battery is charged, the result on the device will be about 12.6-12.9 volts. This is a normal stress that should be on a fully charged battery. If you have frightened with the colors of the probe, the figure will be the same, just appear with a minus sign.

If the motor is running, then the multimeter can also be checked the battery operation, but in this case It will be checked for its work together with the generator, as well as the health of the voltage regulator. When the motor works, the indicators must be slightly higher - from 13 to 14 volts. If the indicator below, for the battery it will mean charging problems, and in case the indicator above - the water electrolysis process will begin.

There is a method as a voltage determine the degree of battery discharge. The voltage is 12.5 - it says that the battery is charged by 90%, the voltage is 12.1 - by 50%, and 12 - by 10 percent. Although the method and approximate, but verified.

To measure the device is also preferably "on the cold", since the newly worked car can give higher values \u200b\u200band mislead. The multimeter checks the degree of charge, but does not give comprehensive information about its performance. To do this, it is better to apply the load fork.

Load plug - the tool is very accurate, but it is rarely found in the "manual" handling, as it is used mainly to a hundred. The charm of this method of verification is that thanks to it will be known for absolutely accurate result.

The load plug works similar to the multimeter manner: it also connects to the battery terminals, but gives a short circuit current. As we said, without load, the indicator should approach 13 volts. The load plug simulates the operation of the starter, which is why the voltage at the time of use "sends".

The fall must be no more than 9 volts. Otherwise, this will mean that the battery is greatly discharged. After removing the load, the indicator "rolls back" to the original value. If under load voltage "sends" to 5, or even up to 3 volts, this means that the battery will not be able to start the car engine.

Extremely important note: load fork It gives the voltage of the order of 200 amps to the battery, and it is not recommended to use it at low temperatures. The ideal conditions for the "field" use of this unit is the temperature of + 20-25 degrees Celsius.

In case the voltage is on a cold battery, there is a risk of hard to discharge.

Another convenient and reliable method, which, however, is suitable only for checking the servants serviced, it is checking the electrolyte level. The method is a bit more complicated than the previous ones, but it gives a good idea of \u200b\u200bthe status of the battery and will tell that he is inside.

First remove the battery and completely clean it from dirt. Recall that it is better to do with rags, dirt and minor corrosion can also be considered using an ammonia-based brake wash.

Next you need to open two corks of the fuel holes. They need to be easily pushed and unscrew, six fuel holes are hidden under them. The electrolyte level in them is checked on the eye, it can be seen when flashlight light. If everywhere the same fluid level is all right if somewhere the liquid does not cover the plate, you need to add distilled water.

In general, this procedure should be carried out regularly, since with each charging of the battery electrolyte in small fractions decomposes into hydrogen and oxygen. In the absence of regular service, the battery simply fails.

The norm is considered to be the level exceeding the height of the plates about one centimeter, or below the neck of the fuel hole for three millimeters. If necessary, to the serviced battery it is worth adding distilled water, but we once again remind: if there is a "non-liable" mark on the battery, or the manufacturers of this specific model Akb is not recommended to top up distilled water into it, you can only resort to previous test methods and, if necessary, replace the battery.

Knowledge, how to properly check the battery, it is important when buying a car with mileage. Often the sellers of cars want to save on trifles, including selling a car with a discharged battery, which can lead to negative consequences for the new owner. Always be alert and check in reality what the seller talks about the health of his car.

And do not forget to check the history of the car before buying. You can do this using the Avtocode online service on VIN or state. number. The system checks the car by more than 12 official bases: traffic police, EAOSTO, RSA, taxi registries and banks, FTS, FCS and others. From the report you will learn: real mileagewhether there are limitations of the traffic police, the CTP, the customs history, the history of fines, participation in the accident and many other important information.

If you do not have an imposition to go to the inspection or you just doubt your experience, book an autocode checkout service. The expert will arrive at the inspection and will hold comprehensive diagnosis Car without leaving no doubt about your choice of vehicles.

Sometimes it is required to check the battery of the car for the charge. Well, for example, there was a car for a long time, and like the engine started - but it is not clear whether it is necessary to recharge the battery or not? After all, "underwear" can play a dick joke, the density of the electrolyte will fall and yours. In the cabin modern car There is no charge sensors, and therefore will get to check the multimeter - now they are simply in bulk, and it will not be necessary to be an expensive option. By the way, the video version will be at the bottom, so read - see ...

There are not a lot of ways to check the battery, two ways using third-party devices, but the latter can be built into the battery itself. If they list them, it is:

• Built-in indicator
• "Load fork"
• Normal multimeter

Today I want to tell about all three types, but I want to start with the "built-in indicator".

"Green window"

Some types of acB have, it has come to us this invention from Japan, after it began to install most companies on non-listed types.

The essence is simple, to the right or left, there is also a small eye, in which there is not a strong glow - indicator. It has three positions, check very easily:

• Green - Battery has a full charge.
• White - low electrolyte level.
• Black - Akb is discharged, you need to recharge.

As you can see if you have this option, then the multimeter and load plug are not needed. They came to the parking lot - opened the hood - looked at the indicator - they decided. If there is no "green window" - urgently recharge.

However, such types are not cheap, they stand at about 20 - 30% more expensive than the average battery, many drivers save, and therefore such a check will not pass! Go to the subsequent methods.

Load fork

"What" - you ask? What is it at all? Yes guys tool is not popular, and you will meet him, perhaps only for a hundred. However, the battery check is the most accurate.

The essence is this - this device is connected to the battery terminals and gives a short circuit current. If a battery can produce 12.7 volts without load, then under load voltage specifically sends.

Under the load, the voltage should fall less than 9 - 10 volts. After disconnected the load, the restoration is restored to 12.7 volt. If under load occurs strong seating, up to 3 - 5V - then the battery "Darky"! It will not launch the car engine.

That is, the load plug mimics the starter load on the car battery, if the load is withstanding, the battery can be used. We will emphasize once again - checking the charge on this device, the most accurate and reliable one. But as you understand, the load plug in a simple garage or at home in 90% of cases will not be! Therefore, check, most likely it will be only a multimeter.

Checking multimeter

Multimeter - This is a device for measuring the current, voltage, as well as resistance and temperature. It is used in many spheres of electronics (when repaired, in the manufacture, when testing, etc.), they can be determined to determine the voltage in almost any electrical circuit (though on my limit in 600V, it is not necessary to measure it anymore). You can also check the battery. Of course, it does not give such accurate testimony, how to say the first and second ways, but you can navigate a little.

Now small instructions:

• We collect a multimeter, the wires must be connected to the "Loading" mode (voltage measurement), and not in Ampera (measurement measurement measurement).

• Remove voltage indicators.

By tension :

• A fully charged battery has a voltage of 12.7 (rare 13.2) volts, then the battery does not need a charge.
• If the voltage is from 12.1 to 12.5, then the discharge is about half.
• If the figure is 11.6 - 11.7V, then this! It is necessary, and the engine he will run hardly.

Now a small video.

Checking the density of electrolyte

If another way to check the battery charge, but it is also not very popular - it is a measure of density. But we again need another device - the range. The thing is that the charged battery has an electrolyte density of about 1.24 - 1.27 g / cm3. The density is measured just a carometer - it is immersed in the "bank" of the battery and the electrolyte is injected into it, further either "float" or "sticks" inside pop up to the desired value.

If the readings:

• 1.24 - 1.27 g / cm3 Your battery is fully charged
• 1.20 g / cm3 - discharge about 25%, you need a small recharging
• 1.16 g / cm3 - discharge by 50%
• 1.08 - 1.10 g / cm3 - full or deep discharge, you need to charge urgently!

The minus of this method is that now many batteries are non-maintained. That is, you can not disassemble and immerse in the electrolyte of the areaometer.

Each car owner seeks his car to serve as longer as possible, so trying to spend maintenance All nodes and aggregates in accordance with the standards. The supply of the engine and auxiliary instruments is responsible for the supply of an electrical energy of the engine ignition system, which can be different and the same as other parts requires periodic maintenance. This article considers the question of how to check the battery charge at home, as well as listed ways to check, and the process is described.

Classification of AKB

For each car manufacturers set a certain type of battery, which is mounted on the conveyor in a special landing place, but the external body has a majority vehicle The same, so when the battery fails, you can replace it with a universal one. Depending on the design, rechargeable batteries There are:

1. The served are the devices that have viewing windows, if desired, can be opened for the production of repair. As a rule, this design is located mainly on universal batteries that are used in various fields;
2. Not served. In this case, the product has a completely cast case, without access to liquid tanks. Such a battery is not subject to service, it cannot be repaired, but to determine the level of charge and check the inner state of the lead plates can be.

For your information. The service life of both types of acB is about the same, the difference is that the first type after the development of its resource can be restored by diagnosing and replacing the electrolyte.

There is also a classification of batteries for internal substanceStores, and also generates electricity. According to this feature there are batteries calcium, hybrid and helium, each of the listed parts has a plastic case and works according to similar technology.

Check

You can check the battery in several ways, but it is always worth starting with an external inspection of the unit, which can be done without removing it with landing. During the inspection, you need to pay attention to the battery case: if there are cracks or chips on it, then this node is not repaired, and it will have to be completely replaced. Checking the automotive battery, especially its external inspection, should be carried out at least once a month, since when the electrolyte flowing out of the cans occurs, the oxidation of all surrounding parts occurs, and a pair of sulfuric acid fall into the air, which is very dangerous for a person.

Also before the inspection, it is worth paying attention to the quality of the connection of the terminals - it often happens that due to the weak contact there is oxidation of copper wires and the formation of "scale". This prevents the free flow of tension on the conductor. Water, dirt or electrolyte residues on the top cover can also lead to the output of the device, because during the closure of contacts the current will be lost on the conductors.

Diagnosis of multimeter

Check the battery can be special devices, such as a multimeter. This tool allows you to determine the inner state of the lead plates, the degree of their decay, as well as clarify the charge level of the battery. To work with it, certain knowledge is needed, so before proceeding with the actions, you need to carefully examine the manufacturer's recommendations.

To determine the voltage and the level of charging, you must install the multimeter to the measurement position, then attach the red contact to the plus terminal, and black to the minus. Next, pay attention to the tool monitor, which will display numbers with a nominal voltage inside the battery.

Important! All manipulations with the battery need to be carried out with disconnected wires and with a plugged engine, otherwise the scoreboard will not show the battery capacity, but the degree of charging it through the generator. Normal for the correct operation of the battery voltage is considered to be the range from 12.6 to 12.9 V, if this standard is less, it suggests that the battery is lost somewhere on the line, or it does not charge at all.

It is worth noting that only the capacity of the current inside the battery can be determined by the multimeter, it will take a more serious tool to clarify the workability.

Diagnostics of the load plug

In order to check the battery under the operating voltage, you will need a special device called a load plug. This tool, which includes a voltmeter, a device for supplying voltage and two terminals. It is allowed to carry out work right by car, the main thing is to disconnect the wires from the landing site.

The device connects to the battery terminals, while it is important to monitor that the polarity of the conductors is respected. The table of the tool should show the load of 12.6-12.9 V, if less, then the battery must be recharged to a normal state. Then the voltage is supplied for a while not more than 5 seconds, after this period, the current drop must be within 10.2 volts. In case the voltage fell below 9 volts, it will not be possible to reanimate the battery and will have to replace it.

There are cases when the voltmeter shows the voltage less than 12 V, even after complete recharging. This suggests that the battery has fully lost its performance, due to the destruction of one of the cans or contact lead plates of different polarity.

To determine the condition of the containers, you can use the multimeter. When stress measurements, if the testimony is 10.4-10.7 V, then most likely one of the cans collapsed. Since the voltage of one glass is 2.1 volts, the lower the total digit of the battery, the less integer tanks remain.

In order to determine exactly which bank has failed, it is necessary to measure the density of the electrolyte in each. For this, a special device is needed - a carometer.

Checking density fluid

How to check the battery on the density of the electrolyte? To do this, you need to open the stopper of each of the cans and lower the flask of the arometer into it, then with the help of a pear to dial a little liquid, until the float is affected by the water. In the center of the flask is a piece of lead or mercury, wanted to a glass cylinder, and on the outer case there is a scale showing the level of density. The electrolyte density is considered normal, equal to 1.27-1.29 grams / cm3.

If this indicator is higher, then for serviceability, it is necessary to dilute the electrolyte with distilled water to normal value. In cases where the density is below the standard, you need to completely replace the liquid to the new one.

It is worth noting! The diagnostics of the battery using the area is possible only on serviced units having observation holes. There is no such possibility on completely sealed batteries, their check is carried out only using a multimeter or voltage fork.

In order for the battery to serve as long as possible, it is necessary to comply with a number of rules:

1. Periodically conduct an outdoor inspection of the battery and check how the part is charging from the generator;
2. On the serviced battery, make measurements of the electrolyte density and, if necessary, add liquid to the bank;
3. Contain a product clean, and terminals to periodically lubricate paste with copper crumb, which will strengthen the contact terminals and prevent the formation of "scale" and oxidation;
4. Use acb only reliable and proven manufacturers having technical certificate quality and warranty;
5. Monitor the state of the electrical wiring of the car, as well as the generator. Optional equipment, such as engine heating elements or autorun, can consume too much energy, so before their installation it is worth carefully learning specifications products;
6. Periodically produce the recharging of the AKB using the current rectifier from the household network. Such prophylaxis will allow the normal voltage inside the battery and will remove the load from the generator.

Thus, if you follow the rules of operation of the AKB and follow the action algorithm, the question of how to check the battery charging, becomes completely solved. All work can be performed independently at home, having a tool required for this.

Video

The starter could not checked the motor shaft, the cake of the taranteel and refused to work. The reason for such behavior is understandable - the battery is discharged. Immediately comes the thought that it is faulty and need to be replaced. How to check the battery know not all. But before you go buy new, you need to properly appreciate the efficiency of the old one. After all, it may be so that the replacement will not give anything.

IN modern car The battery works not only when the engine is started. It is used on small turns with high load in on-board network. At such moments there is no charge. Voltage can fall to the threshold low level And the next launch does not have enough current to turn the anchor of the starter. Therefore, on idling No powerful electricity consumers should not be included.

Insufficient charge may be due to bad work Generator. Wearing brushes negatively affect its work. There are refusals of electronic blocks that regulate the parameters of the on-board network. They can also lead to low voltage.

So how to check the battery and determine its condition?

To determine, and understand the degree of worn out of the battery, you must first conduct an external inspection. There should be no mechanical damage. View the status of the terminals. Better than them once again Clear. Oxides prevent good contact.

Then you need to measure the electrolyte density. Its value must correspond to 80% of the charge. This procedure is carried out by a carometer. You need to unscrew the covers of all cans, alternately dial the electrolyte, and evaluate the density. The float in the flask of the device will rise at different heights. Compare the values \u200b\u200bbelow:

• Fully charged: 1.270 - 1.290
• Charged by 70%: 1.230 - 1.250
• Fully discharged: 1.110 - 1.130

It should be noted in winter time They should be higher. For this you need to follow. Conducting measurements, pay attention to the level of electrolyte.

For preliminary diagnosis Akb needs to know how to check the charge. First, it is necessary to measure the voltage under the stubble engine. Remove the readings with a simple tester. This device is easy to purchase in the store of electrical goods and in the future it is more expensive. It is best to buy a digital version. It will make more accurate readings.

So, check the voltage. If it is below 11.8-12.0 - the battery is probably discharged. The car is most likely not to start. Normal tension There must be a level from 12.5 to 13.0 V. There is a methodology for approximate charge level estimation:

• voltage 12.9 - indicates the charge of the battery in 90%
• voltage 12.5 - 50%
• voltage 12.1 - almost discharged, 10%

It is better to measure the measure before starting the engine. You can definitely determine whether it will be successful.

Run the engine. We re-measure the tester. The norm is a voltage from 13.5 to 14.0 V. If the level is slightly higher, you do not need to worry, after some time it will decrease. It will take 5-10 minutes.

For further action You need to turn off all car devices that consume quite a lot of electricity. And remember again. With the normal operation of the electronic regulator of the machine, the voltage on the terminals will be normal.

Important! At the level of 13.0-13.4 V will not be a full charge current. And if the level is lowered even lower - most likely the problem with the car generator.

It is possible to estimate its serviceability with one simple way. It is necessary to gradually increase the load. First include the Middle Light. Then - Far. Enable music, air conditioning and other devices. Each time to measure.

The voltage should fall a little by 0.1-0.2 V. But its level remains above 13 volts. Otherwise, you need to check the brushes of the generator, most likely they came into disrepair.

Making sure all the above parameters do not go beyond normal work Battery, you can move to the estimate of its load capacity.

Determination of residual capacity

To calculate this parameter, the battery is discharged by a definable value and the threshold time of the threshold is 10.5 V. This operation can be carried out independently. You need to take a 12-volt load with a known current consumption. It can be a few car lamps. They are written at them, according to which the current can be determined (known formula J \u003d P / U).

We make a load with a current of discharge 1/10 from the Nominal Akb in amps-clock. Connect it to the source. The current multiply on time and divide the value to the nominal container. We obtain the percentage of residual capacity.

Ampere-hour characteristic

On this characteristic, too, can be judged chemical source Energy. It shows the number of current that is able to give the battery until the voltage becomes equal to 10.8 V.

Typically, the standard is considered 20 - hour discharge. For example, a source of 60 A / C capacitance is able to give 3 A. You can use all the same bulbs to determine the compliance with this parameter.

Load plug - a special device with which the state of the battery is easily determined quickly and quickly.

It is according to its testimony you can almost unmistakably judge the reliability. The plug is connected to the terminals and measure for five seconds.

If at the beginning of this time interval, the voltage is 12-13V, then at the end it should exceed a 10-volt line. If the charge drops to 9V and below - it is worth thinking about replacing the battery of your car. In the future, he can bring at an inappropriate moment.

Summarize

Of all the above, it is necessary - you should not change the battery if the car is badly started. You must first eliminate the reasons why it can happen.

Having spent time on checking and small diagnostics, you can save your funds. It suffices to produce several simple measurements and computations so that in the aggregate to get full-fledged information about the status of the Akb and the on-board network of the car.

To check the battery, you can construct devices yourself to help. But it is better to buy ready and keep them always at hand. They will be very useful in the future.