Is It Normal for a Car Battery to Get Hot While Charging?

1 Answers
StOlive
07/29/25 4:15pm
It is normal for a car battery to get hot while charging. Since the charging current is relatively large, the electrolyte inside will heat up and boil, so some temperature rise is expected. Additionally, the battery itself has internal resistance, which naturally generates heat when current passes through. However, if the battery becomes excessively hot (to the point of being too hot to touch), it may indicate improper charging practices or a battery issue, which can lead to water loss and shorten the battery's lifespan. For batteries older than two years, if they have not been charged correctly, overcharging can easily cause water loss and result in overheating. If the electrolyte level is low, you can add an appropriate amount of distilled or purified water to dilute the concentration and improve the solubility of lead sulfate, ensuring normal electrolysis. If the battery heats up due to aging, short circuits, or broken plates, it indicates the battery is no longer functional and should be replaced with a new one.
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