How to Repair a Swollen Battery?
2 Answers
It cannot be repaired. The internal changes of the battery have caused the casing to swell and deform. After repair, it cannot meet the original technical standards and poses safety hazards. If it only heats up slightly during normal charging and has minor swelling, it should be fine temporarily, but the best solution is to replace it with a new battery to ensure safety. Many electric vehicle fires are related to this issue. If the battery is swollen, it should not be used further, as charging can also be dangerous. The reasons for lead-acid battery swelling include: 1. Charger parameters: Mismatched charger parameters causing thermal runaway during charging, leading to battery swelling. 2. Quality issues: Problems with the internal electrode groups, such as micro-short circuits or lack of acid, can also cause thermal runaway and swelling of the battery.
I've repaired many car battery issues, and the most common cause of swelling is overcharging or internal aging leading to gas buildup. Remember, safety first: never try to squeeze the bulge or vent the gas yourself, as it poses a high risk of explosion. I always disconnect the battery first to prevent sparks, then check if the alternator's output voltage is around 14V—if it's too high, I adjust the charging system. A swollen battery is basically dead; replacing it is the smartest move. I also recommend cleaning the battery terminals to prevent corrosion and regularly using a multimeter to check the voltage, ensuring no overcharging occurs to avoid similar troubles. Don't try to save money by extending its use—safety is paramount.
