Chemical repair method can be used, the method is: dump the original electrolyte, add pure water and sodium sulfate, potassium sulfate, tartaric acid and other substances mixed solution, take normal charge and discharge several times, and then pour out pure water and add slightly high-density acid to adjust the acid in the battery to the standard liquid concentration, the capacity restored to more than 80% can be considered successful repair. Battery daily maintenance precautions are as follows: Note: the last point is particularly important, because the temperature is too high will increase the internal pressure of the battery and the battery pressure limiting valve is forced to open automatically, increase the loss of water in the battery, will inevitably cause the battery activity to decline, accelerate the plate softening, the shell heating and the shell bulge, deformation and other fatal injuries during charging.