What Causes Car Battery Leakage?

2 Answers
SanAlexander
07/24/25 4:05pm
Car battery leakage is caused by cracks in the appearance or leaks in components. Here are the detailed explanations: 1. Cracks in appearance: Battery leakage is often due to aging or even cracking of the seal between the upper cover and the base. In this case, first inspect the battery's exterior for any cracks. If found, use plastic welding to repair them, and then check the electrolyte concentration to ensure the battery functions properly. 2. Component leaks: Alternatively, leaks may occur at the safety valve or wiring connections. Remove the battery cover to check for any leakage marks at the safety valve. If present, the corresponding parts should be repaired or replaced.
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StephenAnn
08/11/25 8:58am
My old car also leaked electrolyte last year. The mechanic said it was mainly due to the aging and cracking of the battery casing, especially the plastic shell of batteries that have been used for five or six years becomes severely brittle. Additionally, a loose battery mounting bracket can cause collisions and cracks when driving on bumpy roads. Once after driving on a mountain road, I found liquid traces on the floorboard. In summer, the electrolyte expands more noticeably, and if the sealing ring at the filling port is aged, it can seep out white crystals, which can also corrode the battery tray. Now, during every maintenance check, I have the battery base inspected for any signs of corrosion.
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