If the battery appearance is not damaged, bulging, there is no short circuit, and there is no sign of breaking the road, the following methods can be used to try to repair the battery: 1, the use of positive and negative pulses to depolarize the battery, and then completely discharge, so that the cycle three times, if the capacity has recovery signs, can be more than a few cycles to achieve better repair results 2, add water repair, add water must be added ion water or pure water, do not add tap water, will cause the battery self-discharge problem.