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Why Does the Battery Get Hot While Charging?

1 Answers

VonColin

07/29/25 10:49pm

The main reasons for a battery becoming hot or overheating during charging are two-fold: one is the natural degradation and aging of the battery itself, and the other is a malfunction in the charger. Voltage: The standard charging voltage for a car battery is 12V. During the charging process, the voltage typically ranges between 13.5-14.5V. When charged in the vehicle via the rectifier, it should not exceed 15V. If using an external charger, the charging voltage is usually around 14V. Current: During the charging process, the charging current should not be too high. It is strongly recommended that car owners avoid using fast charging. Instead, use a current that is half of the rated charging current and extend the charging time to twice the normal duration.

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