What Causes a Battery to Overheat?

1 Answers
McKimberly
07/29/25 12:47pm
The reasons for a battery overheating are: Issues with the battery itself: Battery aging, increased internal resistance, dried-up electrolyte, or internal short circuits can cause overheating. As the battery is used more frequently, including during discharge and charging, water molecules within the battery gradually dissipate, leading to gas evolution and water loss, which in turn causes the battery to heat up during electrochemical reactions. Additionally, during the charging and discharging process, battery solution can form sulfate crystals that precipitate and stick to the lead plates, increasing the battery's resistance and causing it to heat up. Charger issues: Most chargers lack pulse functionality, let alone negative pulse depolarization capabilities. Such chargers often fail to maintain a constant voltage during the later stages of charging, causing the battery voltage to exceed permissible limits. This results in excessive gas evolution, water loss, and overheating of the battery.
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