Lead-acid battery repair method


Lead-acid batteries are a type of storage battery.Fully sealed structure and modern production process.With its good discharge performance,pollution-free,long life,safe and reliable excellent performance, so it is very widely used. However, if it is used improperly, it will cause damage to the battery and even scrap it. In fact, as long as proper repairs are made, most of the battery’s capacity can be restored to some degree. Lead-acid battery repair refers to the use of physical or chemical methods to solve the deterioration of lead-acid batteries, eliminate the lead sulfate crystals attached to the surface of the lead-acid battery plate, and generate a protective film to make the electrode plates no longer adhere to the lead sulfate crystals. Extend the service life of lead-acid batteries. Next, this article will introduce you to battery repair methods and principles.

Repair principle

Repair methods include physical, electronic and chemical methods. Among them, the chemical method is to inject a special electrolyte (usually a translucent liquid) containing an “active agent” into the lead-acid battery. The chemical reaction eliminates lead sulfate crystals, promotes the smooth flow of electricity in the battery and regenerates the aging battery. To achieve the effect of extending its service life.


1.Deep discharge repair

The full-charge and full-discharge repair method is to repair the battery after it is fully charged and then fully discharged. The full-charge and full-discharge repair method mainly has a certain repair effect on the slightly damaged battery. At the same time, this method can also effectively activate the deep active material of the battery and increase the battery capacity. It is suitable for lightly vulcanized batteries and batteries with high internal resistance. The key to this method is that the discharge must be sufficient, and each battery must be fully discharged separately, fully charged and discharged for 1 to 2 times, and the capacity of the battery is average can be improved. The full charge and full release repair method cannot be used frequently, and can be used once every three months at most.

2.Pulse repair

For sulphurized batteries, some special pulse repair instrument can be used to charge and discharge the battery several times to eliminate sulphurization. One of them is the high voltage and high current pulse charging, through the negative resistance breakdown to eliminate sulfation. This method is fast and effective, but the impact on the life of the battery is relatively large. Another method is to use small current frequencies of up to 8KHz or more, using large crystalline resonances to dissolve, which is slower and more effective, but the repair time is longer, often more than 120 hours.


Mainly through the sulphurization of the electrode in pure water charging, is the sulphate gradually dissolved and excluded from the battery. The specific method is to pour out the electrolyte, replace it with pure water, charge it with about 0.05C current, charge it for more than ten hours, then pour out the electrolyte, replace it with pure water, charge – release – charge it repeatedly. -Discharge several times, after tens of hours or even ten days, finally adjust the density of electrolyte in the battery to the standard solution density with a slightly higher density electrolyte under sufficient charge, the general vulcanization phenomenon can be lifted and the capacity restored to more than 80% can be considered as successful repair.

Precautions during the repair process

1. Use a multimeter to monitor the voltage of each battery and the heating of the battery at any time.

If there is any leakage of electrolyte from a certain hole, use a syringe to suck it away at any time to prevent the battery from short-circuiting. For individual holes that generate heat and gas and overflow the electrolyte, do not add electrolyte. Replenish the fluid in time with distilled water. The serious heating of individual holes may be caused by a short circuit, large internal resistance or high electrolyte specific gravity.

2. During the repair process, if the following symptoms occur, the battery cannot be reused:

(1) Check the temperature of the battery case frequently (you can feel it by touching it with your hands). If the local temperature is higher than the temperature of other parts, or if the electrolyte in a certain cell is boiling, the gas out is serious, indicating that there is a short circuit in the electrode plate in the cell phenomenon.

(2) The battery cannot be charged for a long time (the voltage does not rise), the charging time is more than 10 hours after the desulfurization repair and the charging is not displayed, or a part of the battery is seriously heated. This may be a short circuit inside the battery cell, or It is caused by the plate falling off. The tester must be disconnected. Check the voltage and the stored charge. The battery with low voltage or low charge (without storage) cannot be used, or requires a longer repair time.

(3) After the tester is connected to the battery to start the machine, if the tester cannot output normal voltage and current and has a “creak…click” sound, it means that the internal circuit of the battery has been disconnected and the tester cannot output normally. The battery should be removed to avoid damage to the tester.

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