1. The air vent is blocked If the vents of the lead-acid battery cover are blocked or not unblocked, the gas generated in the case of too long charging time or too high charging voltage will gradually accumulate, which leads to the increasing pressure in the battery shell and finally leads to the swelling of the battery.
When the electrolyte levels in a flooded lead-acid battery go down exposing the plates, always use distilled water instead of acid when topping off a flooded lead-acid battery. During the charging and discharging processes, water that undergoes electrolysis and evaporation is lost from the battery. This leaves a concentrated sulfuric acid solution.
The air vent is blocked If the vents of the lead-acid battery cover are blocked or not unblocked, the gas generated in the case of too long charging time or too high charging voltage will gradually accumulate, which leads to the increasing pressure in the battery shell and finally leads to the swelling of the battery. 2. Too long charging time
When the battery acid is overfilled, there are increased chances of spillage and battery acid leakages. When the car encounters vibrations, the acid will move freely within the battery when the right levels are maintained. When the battery is overfilled, such vibrations will cause the acid to spill out through the battery caps. 2.
The overfilling of the battery may occur at the initial stage when acid is added to a dry. It may also occur during subsequent water addition phases during maintenance. Most batteries will have a marked level through which the battery acid should not fall below or rise above.
During the charging and discharging processes, water that undergoes electrolysis and evaporation is lost from the battery. This leaves a concentrated sulfuric acid solution. If you add battery acid, you will be increasing the concentration levels even further and damage the battery.