Can a car battery be repaired? Ways to resuscitate a car battery at home

02.09.2019

Salon

Batteries are a stable source of constant voltage, they are indispensable in individual designs and devices. But of course there are no eternal things on earth, and with batteries, time passes and they are no longer suitable for use, what should I do? Throw it away and buy a new one? You can of course, but it's better to try to repair them. On the market you can find a sea of batteries of different types of capacities and voltages. Mainly use acid alkaline and lithium batteries. Today we will talk about ways to repair such types of batteries as lead. Acid batteries - more commonly referred to as lead-helium batteries. Two lead plates are immersed in sulfuric acid, one plate is positive, the other is negative. Such batteries are most often used in automotive technology and in flashlights. They have a relatively short lifespan. They can be repaired (restored) in several ways.

The first method of multiple charging with a small current rating with short time intervals between charges. By the end of the first and subsequent charges, the voltage on the battery gradually increases, and it stops accepting a charge. During the break, the electrode potentials on the surface and in the depth of the mass of the plates are equalized, while the denser electrolyte from the pores of the plates flows into the interelectrode space and reduces the voltage on the battery during temporary breaks. During a cyclic charge, as the battery gains capacity, the density of the electrolyte begins to increase. When the density becomes normal, and the voltage on one section reaches 2.5-2.7 volts (the nominal value of each can is 2 volts), the charge is stopped. Repeat this cycle 5-8 times. The charging current is ten times less than the battery capacity, let's say the battery has a capacity of 1000mA / h, then the charge current should be between 80 and 100 milliamps.

The second way to restore acid batteries is to replace the electrolyte. We drain the electrolyte from the battery and rinse the battery with hot water several times. Next, take 3 teaspoons of soda and dilute in 100 ml of water. We boil water and immediately pour boiling water into the battery, wait 20 minutes and drain. This process is repeated several times. Then rinse the battery 3 times with hot water. This recovery method is very convenient to use for car batteries. At the last stage of work, we pour a new electrolyte and charge the battery for 24 hours, the repaired battery is charged once a day for 10 days, the charge lasts 6 hours, the charger parameters are 14-16 volts, the charge current is 10 amperes (no more).

The third way is reverse charging. To do this, you need a powerful voltage source (a welding machine, for example), the voltage of the charger is 20 volts, and the current strength is 80 amperes or more, open the plugs of the cans and charge them only back - we attach the plus of the power source to the minus of the battery, and the minus of the power source to the plus battery. At the same time, the battery will boil, but do not pay attention, we charge for 30 minutes, then drain the electrolyte, rinse with hot water and pour in a new electrolyte. We take an ordinary charger with a current of 10-15 amperes and charge the repaired battery for 24 hours, just do not confuse the polarity, since the factory positive pole will already be negative, and the negative positive, about repair and

How to restore the performance of a car battery

Recovery of battery capacity

The simplest and most common way is to repeatedly charge with a small current with breaks between charges. By the end of the first and subsequent charges, the voltage on the battery rises, and it ceases to accept the charge. During the break, the electrode potentials on the surface and in the depth of the active mass of the plates are equalized, while the denser electrolyte from the pores of the plates diffuses into the interelectrode space and reduces the voltage on the battery during breaks. In the process of cyclic charging, as the battery gains capacity, the density of the electrolyte increases.
When the density becomes normal for this type of battery, and the voltage on one section reaches 2.5-2.7 V, the charge is stopped.

Multiple charge modes:
Charging current 0.04-0.06 rated capacity. The time of the first and subsequent charges is 6-8 hours. The break time between charges is 8-16 hours. The number of cycles (charge-break) - 4-6 hours.
J charge = 0.04+0.06*Cn.

Restoration of a lead battery, with not a complete loss of capacity.

To restore a battery that has lost its capacity - to dissolve sulfates (disulfate), you just need to apply high voltage to it, and for a long time, keep it that way. However, as the voltage increases, the outgassing intensity also increases. Therefore, we need to pause to calm the battery.

We take a battery that has lost capacity due to sulfation. We pour water into it if it has boiled away, but not much, about as many cubic centimeters as according to the ampere-hour passport. And that may be less. We connect it, through a time relay, to a current source, which connects the battery to the source for 13 minutes and disconnects it for 13 minutes. First, we apply 14.3-14.4 volts, we do 2 full cycles. We keep it energized, after it reaches the set value, on the battery, in this case 14.3-14.4 volts, for a day. After that, we increase the voltage to 14.5-14.6 V, we also do two cycles. Then we increase the voltage to 14.8 V, and do so many cycles until, with a control discharge, you find a sharp reduction in the increase in capacity. Cycles are needed, not only to keep track of how much capacity is added, but also to ensure that the electrolyte mixes with the newly formed acid from lead sulfate. After the battery has been restored, add water, until you see that the water has ceased to be absorbed, be careful not to overfill. After that, a couple of cycles for mixing the electrolyte need to be done, but it is not necessary to charge with a high voltage.

Experimental data

For experiments with the disulfation process, a time switch was made, which turned on the current for 13 minutes and turned it off for 13 minutes. The conditions and the duration of the voltage are approximately the same. Duration of action, about a day.

If applied, the voltage is 14.3 volts on a sulfated battery 10 Ah, a day, 13 minutes, after 13 minutes. After that, we carry out a control discharge on a 2 ampere light bulb, then there is an increase in the glow time of this light bulb by 6-7 minutes, if with a working battery of such a capacity, it shines for 5 hours. When applying 14.5 volts, for the same session, 10-13 minutes of glow are added. When applying 14.8 volts, 24-29 minutes of capacity are added. In all cases, strong outgassing is observed, the higher the voltage, the greater the outgassing.

From these data it follows that it is more profitable to apply 14.8 volts for disulfation.

The addition of capacitance occurs at the moment the voltage is applied, and depends on the time of its action.

The optimal time, I consider 1 day, the time of action of the voltage of 14.8 volts. That is, after the voltage has reached 14.8 volts, you need to hold the battery for a day, through a time relay, 13 minutes after 13 minutes.

Due to the fact that during disulfation there is a strong gas evolution, I recommend not to pour a lot of water, pour as many cubic centimeters as the number of ampere-hours the battery has according to the passport. So that pores remain, for the release of gas, otherwise, mechanical gas action can shower the spread.

Restoring battery capacity is fast, but not very easy

The method is highly efficient and fast (the battery is restored in less than an hour).
A discharged battery is pre-charged. The electrolyte is drained from a charged battery and washed 2-3 times with water. An ammonia solution of Trilon B (ETHYLENEDIAMINETETRAACETACETE sodium), containing 2 weight percent Trilon B and 5 percent ammonia, is poured into the washed battery. The time of desulfation with a solution is 40-60 minutes.
The process of desulfation is accompanied by the evolution of gas and the appearance of small splashes on the surface of the solution. The cessation of gas evolution indicates the completion of the process. In case of strong sulfation, the treatment with the solution should be repeated.
After treatment, the battery is washed at least 2-3 times with distilled water, then filled with an electrolyte of normal density.
The flooded battery is charged with charging current to the nominal capacity according to the recommendations in the passport.
On the issue of preparing a solution, it is advisable to contact enterprises that have chemical laboratories. Store the solution in a dark place in a vessel with a hermetic lid to prevent evaporation of ammonia.

Restoration of capacity by disulfation method with a constant, stabilized voltage.

This recovery method has 100 percent efficiency, in other words, if it is not possible to restore the battery in this way, then it will not be possible to restore it in any other way. I restored all kinds of batteries in this way and with a complete loss of capacity, the voltage on which was about zero volts (0.5V), and not a complete loss when the voltage was less than 13.0V.

The method itself is very simple.

We supply 14.7 - 15 Volts (we limit the current to 1.5 amperes, if the battery is 10-15 Ah) to the battery that has lost its capacity, and so we leave it for 12-15 hours. The battery will boil, but do not be afraid, it should be so.
After that, we discharge a little, for example, we connect a light bulb so that the electrolyte is mixed.

Then we put it on charge just like the first time: we supply 14.7-15 Volts (the voltage will drop, but it should not exceed 14.7-15 Volts when the battery is charged, that is, limit 14.7-15 V), and so leave for another 12-15 hours.

After that, turn off the voltage stabilizer, and let the battery settle for about a day, after which we measure the voltage, which should be in the region of 13.0-13.2 volts at +20 degrees.
If the voltage is less than this value, we repeat the recovery cycles until the voltage rises to the indicated figures.

If the voltage on the battery does not reach 13.0 V, but somewhere around 12.7 V, this may not be bad either, for a low electrolyte density this is a normal voltage. If the voltage did not even reach 10 volts, this battery was mechanically broken: the plates were shorted, the plates were sprinkled, etc. Such a battery is expensive only for scrap metal.

It is better, of course, to do a check discharge after each recovery cycle, so that we have an idea of adding or not adding capacity. To do this, we find a light bulb with such a load that the battery is discharged in 4-5 hours, so that we do not have to wait a lot and measure the discharge time, but keep in mind that the battery voltage cannot be allowed to drop below 10.5 V during discharge.

Another very important note. If the battery is sealed AGM or gel, then do not leave the valves open, air must not enter the plates, otherwise the capacity will be lost. Before restoring such batteries, it is advisable to add water. To do this, tear off the top plastic cover to get to the rubber valves, raise the valves and add distilled water from the syringe, but not much so that the water covers the plates a little (do not pour more!). To see the water, you need to shine something, for example, with a lighter-flashlight. We close the valves, press the lid on top and wrap it with tape.

If the battery has lost all capacity, this is when the voltage is less than 10 V.

We connect the rechargeable battery to a stabilized voltage source on which 15 V should be configured (the current is limited to 1/10 of the battery capacity). And wait 15 hours. At this time, look from time to time, at some time the battery will start to slowly receive current, and the voltage will drop at that moment, then the current will increase to the maximum and the voltage will drop to the lowest point (usually it is about 12.4 c), after this moment we wait 15 hours for the battery to charge. Then we restore the battery as having partially lost its capacity (see above).

There are cases when the battery does not start to receive current even after 15 hours. Then you should increase the voltage to 20 volts, I added more, sit for a few minutes and look at the current, it can go right away.

If the current does not go right away, then you need to look more often, the main thing is not to miss the moment when the battery is charged so that the voltage on it does not exceed 15 V, that is, we need to limit the voltage as quickly as possible before charging.

Yes, another very important note, do not stop the recovery process halfway, be sure to complete the cycle.

Restoring the battery with a short current pulse of large magnitude.

Sometimes it happens that due to some reason, the plates of one of the battery cans are somehow closed and their charge becomes impossible.
It is logical to assume that the cause of the short circuit can be eliminated by burning the problem area. To do this, the battery is connected to a source of very strong current, at least 100 amperes, for example, a welding machine, with a rectifier diode at the output. The circuit closes for 1-2 seconds, during which time the cause of the circuit should evaporate due to severe overheating.

Several applications and the effectiveness of this method in practice.
Personally, I came across one 7 a.h. closed-cell lead battery CSB. The battery has been sitting for several years without being charged. The reason for the short circuit, most likely, was that the battery plates, due to abundantly deposited sulfate, were warped, and the separator was pierced.
By connecting to the welding machine for 2-3 seconds, the short circuit was eliminated, but subsequent recovery measures were unsuccessful, which is not surprising, because lead-free batteries that have completely lost their capacity are not restored. But the application of this method to other types of batteries can be quite reasonable.

Example 2
A friend told me about his experience of applying this method to a nickel-cadmium (NiCd) battery, he managed to revive and put into operation a mining nickel-cadmium battery, “KCSL 12”, for horse racing.

Example3.
Another friend drained the lithium-ion (Li-ion) battery from a portable DVD player. In lithium-ion batteries, when deeply discharged, a copper shorting shunt is sometimes formed between the plates. The result of the restoration was that the capacity of the battery was higher than it was when it was new.

Restoration of serviced batteries, in particular automobile ones.

There is one way to restore your battery.
The essence of the method
Pour out all the electrolyte. Pour distilled water into the battery until the plates are covered. We connect a constant voltage of about 14 volts to the battery and leave it for 1-2 hours. Then we listen to the battery, if we hear that it is bubbling, we slightly reduce the voltage. We leave it for half an hour and listen again: our task is to keep such a voltage on the battery so that gas emission is minimal, but so that it exists.
We keep, under this voltage, the battery for a week, and preferably two. After that, the distilled water in the battery will turn into an electrolyte of low density, due to the dissolution of lead sulfate and its transformation into sulfuric acid molecules, as a result of a chemical reaction. We drain all the electrolyte, and fill again with distilled water. Also, we connect the voltage, make sure that the battery is a little, sometimes bubbles, and hold for 1-2 weeks.
If the electrolyte no longer changes density, then disulfation can be stopped.
After that, we drain the formed weak electrolyte and pour in the electrolyte of normal density. We connect your charger and charge the battery as usual, until it is fully charged.
After that, you need to measure the density of the electrolyte and align to normal density in all banks.
Your battery has been restored.
If you have nothing to measure the level of low-density electrolyte, then, just in case, you can perform one more, third, such cycle.

It makes sense to apply these procedures if the battery plates are still intact, if sediment is clearly visible in your battery, especially with pieces of lead plates, then it is clearly not worth it.

1932 Views

It often happens that the battery (battery) fails due to non-compliance with the operating rules or due to mechanical damage. The main task of the battery is to supply power to all electronic devices in the car.

Battery types

Modern batteries are divided into several types:

acid;
alkaline;
gel.

In the automotive industry, acid-type batteries are used. The battery is the most important element for the operation of the car, and its breakdown will not make it possible to continue the operation of the vehicle. The battery breaks due to misuse or improper maintenance. Its malfunction is conditionally divided into two options:

mechanical failure that can be repaired with your own hands;
damage to internal elements that cannot be repaired with one's own hands.

To put the device in order, you need to understand its design, and after that you can start fixing it.

Battery device

The battery consists of a sealed case, inside of which 6 sections are inserted, they are called banks. In the banks there are lead plates with an active mass applied to them. These plates are divided into positive and negative, all arranged alternately. A separator is placed between them, which isolates them from accidental contact.

The plates form blocks, each of which is attached to the bridge with a bridge called a barette. The barettes connect all the banks with a bridge, which has an outlet to the car battery terminals. All jars are filled with electrolyte, which promotes the formation of a chemical reaction. The battery is not capable of generating electricity on its own, it is its storage, so a generator is installed in the car.

Manufacturers provide two options for a car battery:

the first of them is serviced, on the cover of the body of which there are screw plugs for each can;
the second is maintenance-free, where the housing cover has no plugs, only designed to relieve excess pressure.

In the event of a malfunction, only serviceable batteries can be repaired. They can be restored in case of slight damage.

Malfunctions and methods for their elimination

Several parts of the battery are damaged, namely:

its terminals, the damage of which consists in excessive oxidation;
the formation of cracks in the body, they arise due to poor fastening;
internal damage to the plates and bridges that go to the battery terminals.

Almost all of them can be repaired with your own hands and restore the battery to working capacity. Malfunctions are visible by simple inspection and do not require additional diagnostics. After inspecting and identifying a breakdown, you can start repairing the car battery.

Due to the weakened contact with the wires, the terminals begin to oxidize strongly. Eliminate oxidation by removing the wires and a good stripping of each terminal.

To do this, sandpaper is taken, and the terminals of the car battery are cleaned with it to a full shine.

The crack in the case is sealed with a soldering iron and a piece of plastic.

Before soldering, the electrolyte is drained from the battery. Having sealed the crack, the tightness of the battery is checked with distilled water poured into it.

For reliability, a piece of plastic should be soldered over the soldered crack.

You will need

- ready electrolyte
- distilled water
- hydrometer
- charger - for example, "Cedar" with an automatic cycle mode that excludes recharging
- desulphating additive added to the electrolyte
- pipette and small enema

Instruction

Most of the time it is caused by improper use. Idle time in traffic jams with the headlights, fan, radio turned on deplete it so much that it becomes impossible to restart the engine. The forgetfulness of drivers who leave the dimensions on for a long time also leads to problems when turning on the starter.
If its capacity has decreased due to prolonged discharge, sulfation of the plates, a long charge-discharge cycle will help bring it back to life.

"Resuscitation" should begin with washing the battery with distilled water, pouring out the old electrolyte. Turn over and shake out all the debris. And then point by point:

Dilute the additive in the electrolyte and pour it into the battery.

Connect the charger (do not tighten the fill plugs!) and start the charge-discharge cycle in automatic mode.

Carry out the cycle until the voltage at the terminals reaches 13.8-14.2 volts.

Discharge the battery through the connected bulb to a voltage of 10.8 volts.

Start the charge-discharge cycle again, note the charging time and the amount of charging current. Multiply to find the capacity of the battery. When the capacity rating is reached, complete the restoration.
These operations will help not only restore the car's battery for further operation, but also teach you how to properly handle it in the future.

Sources:

battery recovery

There are a lot of reasons for the "death" of the battery, it can be sulfation of the plates, exposure to severe frost, and much more. To "reanimate" the battery, you need to carry out a series of actions that will help restore its performance.

You will need

- electrolyte;
- additive;
- distilled water;
- Charger.

Instruction

Leave for 48 hours, this is necessary so that the electrolyte squeezes out excess air and dissolves well. If after that there is not enough volume of liquid, then add electrolyte to the recommended level. Usually there is a mark on x, up to which the electrolyte should be poured.

Connect and turn on the charge-discharge cycle. This is necessary to restore battery capacity, you can not charge immediately. After a kind of "resuscitation", turn on the device in the "charging" mode. Turn on a current of about 0.1 A, do not forget to monitor the voltage at the terminals. Be careful not to allow heating or boiling of the electrolyte, if this happens, reduce the current. Charge until the terminal current reaches 2.3 - 2.4V per section.

Halve the charging current and leave the battery for another 2 hours. During this time, the electrolyte density and current should remain unchanged. If after pumping the battery there is not enough liquid, add electrolyte or plain distilled water.

Discharge the battery with a regular light bulb. Repeat the entire battery cycle from the beginning. It needs to be pumped well. If the discharge is very fast, try adding a little more additive. This method of restoring capacity and performance will help extend the life of the battery for many years.

If during charging the electrolyte hopelessly boils, you can safely throw out the battery, nothing will help it. The same can be done with a frozen device, when even visually you can notice the "swollen" sides.

The battery is the most important part of the car. It drives the starter of the car, which is necessary to create revolutions of the crankshaft, which will start the engine. Cars are equipped with a special charging relay that charges the battery while the engine is running. But battery drain can still happen for a number of reasons. During long-term operation of the battery, the density of the electrolyte drops and you have to restore the battery.

You will need

- electrolyte with a density of 1.27-1.29;
- Charger;
- hydrometer;
- desulfating additive;
- distilled water.

Instruction

Remove battery plugs. Use a hydrometer to measure the density. Then drain the electrolyte from the battery. It is necessary to rinse its sections with distilled water. Pour water into each neck and pour it out after a while. Repeat this process until the water comes out clean, free of charcoal and other debris.

Fill the battery with new electrolyte and add a desulphating agent. Now wait two days for the additive to dissolve in the electrolyte. During the same time, air will be removed from the battery sections. After that, measure the density and, if necessary, add electrolyte.

Connect the charger to the battery. Until you need to fully charge it. Set the current to 0.1 amps. Discharge and charge it with a rectifier. This is necessary to ensure normal capacity. Do this until the voltage at the terminals reaches 13.8 volts. Make sure that the electrolyte does not boil or heat up. This may destroy the battery. Next, reduce the current by half. If the voltage at the terminals does not change when charging for several hours, stop charging.

Add distilled water to the required density. After that, discharge the battery to 10.2 volts. After that, check the density, and charge again. Then add additives to the battery. After that, the battery can be used.

Helpful advice

In a remanufactured battery, as well as in a regular one, never add electrolyte. Always use distilled water to make up to the required density. Charge at lower currents.

If you have a non-working battery on hand, you can try to restore it. Of course, in some cases, for example, if it is frozen and the electrolyte immediately boils when charging, this cannot be done. With some other malfunctions - sulphation, partial destruction of carbon plates - the battery's performance can be restored.

You will need

- electrolyte;
- distilled water;
- Charger;
- small hydrometer;
- tester;
- desulfating additive.

Instruction

Drain the electrolyte. Rinse with distilled water. Shake, turn over, shake out all the debris. Do this until no more charcoal is washed out. If this does not happen, the carbon plates are destroyed. Stop flushing - nothing will help yours. However, quite often this procedure helps to eliminate the shorting of the plates.

The next stage is the elimination of salt deposits on the plates. Refill with fresh electrolyte. Add . Leave the battery for two days. During this time, the additive will dissolve, air bubbles will rise to the surface. If necessary, add electrolyte to the nominal volume. By the way, the additive can be dissolved in advance.

Remove the plugs, connect the charger. At this stage, there will be a “training” i.e. charging and discharging the battery until its normal capacity is restored. Set the charging current to approximately 0.1 A. Make sure that the electrolyte does not heat up. Reduce the charging current if necessary. Monitor the voltage at the terminals. It should reach 2.3-2.4 V per battery section.

Reduce the current by half and continue charging. If the voltage at the terminals does not change within two hours, stop charging. Bring the density up to nominal. To do this, add electrolyte or distilled water.

Connect a light bulb to the battery, the current of which is approximately equal to 0.5-1 A. Discharge the battery until the voltage value at the terminals is 1.7 V for each section. If the capacity does not reach the nominal value, repeat the charge cycle and add a little more additive to the electrolyte. Close plugs. Your battery has been restored. In the future, follow the general recommendations for battery maintenance.

Causes and elimination of battery discharge

The external cause of the malfunction is easy to detect during inspection: the connection to the on-board network is broken due to oxidation of the terminals or due to damage to the plastic case (cracks or mechanical holes). In case of serious malfunctions, it is possible to repair and use the battery only if it belongs to the serviced batteries. The oxide on the terminals is easy to remove, and solder the cracks, after draining all the electrolyte. Additional flushing of the battery may take up to a month, since after the electrolyte is drained, distillate is poured into it, washed, and charged. Faster chemical washing is carried out using an ammonia solution and Trilon B. Before the procedure, the electrolyte is drained from the discharged battery, and the ammonia solution added after pre-rinsing with distillate will boil. After boiling, the solution is drained, the box is washed, charged again.

It is worse if the plates themselves are damaged: sulfation - a decrease in power, overheating, boiling of the electrolyte or shedding of the plaster with a short circuit of the lead plates. It is almost impossible to remove the malfunction in such cases. It is the improper maintenance of the battery (long charge, or, conversely, insufficient) that leads to irreversible violations.

To remove the whitish oxidation residue, use a rag and then carefully clean the contacts with sandpaper.

The second step is to fully charge the battery with subsequent discharge (charge-discharge cycle with a battery capacity of 60Ah at a voltage of not more than 3.6A). If everything is done correctly, the density of the battery should be 1.27. After fully charged, use an automotive incandescent lamp for a test discharge. The lamp power must match the battery capacity. With proper discharge, the voltage at the terminals should drop to 10.2 V. Then put the battery back on charge, this time the final one.

A more gentle method is to supply the battery with energy using minimal current charges. To do this, you must have a special generator.

If the battery is swollen in the cold, then it cannot be restored, only a complete replacement. To avoid problems with the car, once every six months, fully charge the battery.

A car battery is mostly designed to start a car engine. In addition, the battery keeps the car's heart running during a generator failure, and charges electrical appliances (such as a mobile phone) when the engine is off. The principle of operation of the device is based on the generation of current by the interaction of lead oxide and sulfuric acid (electrolyte).

Composition of the accumulator: The standard accumulator battery consists of 6 cells, 2 volt each. Each of the 6 elements is a set of lattice plates of lead immersed in a container with an electrolyte.
As a rule, even the highest quality batteries do not last forever. Most often, devices fail in the summer due to very high temperatures ().

Repair of car batteries is required for the following malfunctions of the unit:

swelling and deformation of plate blocks;
damage to the cans and / or battery case;
closure of the plates, which provokes shedding of the active mass;
sulfation of the battery plates caused by a strong discharge of the battery;
internal break in the network caused by mechanical separation of the plates with output terminals.

As for the first malfunction, in order to restore the battery to working capacity, it is necessary to replace all the plates, so it will be easier and cheaper to replace the unit with a new one.

Damage to cans is removed by replacing them or restoring cracks by any known method. But again, it’s not expedient to repair such a battery injury, because the cost of repair will not differ much from the cost of a new battery.

It is very easy to detect a short circuit of the plates in the battery. As a rule, a breakdown should be sought in a highly heated section with a small amount of electrolyte. A short circuit most often occurs if the battery is in a discharged or half-discharged state in extreme cold. The density of the electrolyte in a discharged battery can drop to 1.09 g / cm3, and freezing of the substance is possible already at a temperature of -7 degrees, while freezing of a fully charged battery with an electrolyte density of 1.28 g / cm3 is possible at a temperature of -65 degrees Celsius . This failure cannot be repaired, only replacement of the plates is required here. The cost of this operation is small, but not all car services agree to such car battery repairs. As for replacing the plates yourself, it is better not to do this, because the batteries contain sulfuric acid, and it is very toxic. To work with this acid, you need training, special equipment and a set of protective equipment. In order for the preparation is not needed, only the study of the features of the repair.

A sign of shedding of plates in the battery is the dark color of the electrolyte. In some cases, the battery can be restored by washing the plates with distilled water. But if there are a lot of crumbled particles, then the mechanism, most likely, cannot be restored.

Do-it-yourself battery repair - instructions

He will consider the procedure for desulfating the plates, which you can easily do yourself. So, the repair and restoration of batteries affected by salt deposits on the plates (sulfation) consists of the following procedures:

Dissolve the desulfating agent in fresh electrolyte with a density of 1.28 g/cm3. Carefully observe the proportions described in the corresponding battery instructions ().
Pour new electrolyte into your vehicle's battery.
Unscrew the plugs and connect the charger. Charge with low current. Make sure that the battery does not heat up or boil. Reduce the current even more when the voltage at the terminals reaches from 13.8 to 14.4 volts and measure the density of the electrolyte. After another 2 hours, measure the density of the electrolyte again. If the readings have not changed compared to the previous readings, then the battery is charged.
Now bring the electrolyte to the optimum density (1.28 g/cm3) by adding a high density electrolyte or distilled water.
After charging the battery, it is necessary to discharge it, thus restoring the capacity of the mechanism. Connect a light bulb to the battery and, by limiting the current supply, wait for the voltage at the terminals to drop to 10.2 volts. Next, calculate the battery capacity. To do this, multiply the discharge time by the discharge current. If the capacity is below the nominal capacity, then charge-discharge until it is restored.
Everything, the repair of car batteries is over. Add a little desulfating additive, and that's it, the battery can be installed in a car.

There is another way to restore the battery, it is faster:

Charge the battery to maximum and drain the old electrolyte. Rinse the device several times with distilled water.
Next, pour in a special cleaning solution consisting of ammonia and trilon for 40-50 minutes.
Drain the solution and flush the battery cavity with distilled water.
Fill in new electrolyte and charge the battery.

Repair of the battery terminal involves restoring their contact with the battery bolts.

So, repair and maintenance of batteries in some cases can be carried out independently without much hassle, but service employees, as a rule, have special training to work with these mechanisms.