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

2 Answers

ValentinaLynn

08/28/25 2:24am

It is normal for a car battery to get hot while charging. Here are the relevant details: Precautions for charging a battery: In cold weather, check whether the electrolyte is frozen before charging the battery. Do not charge a frozen battery. Before charging, check the electrolyte level. Do not charge if the electrolyte is insufficient. During charging, measure the density and voltage of the electrolyte approximately every hour and check its temperature. Reasons why a car battery gets hot while charging: It is normal for a car battery to get hot while charging. Since the charging current is generally large, the electrolyte inside will heat up and boil. The battery itself has internal resistance, and passing current through it will generate heat.

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DeAshley

09/09/25 7:49am

It is indeed normal for a car battery to become slightly warm during charging. Chemical reactions occur in the battery during the charging process, generating some heat, which is unavoidable. From my experience handling battery charging multiple times, mild warmth is actually a good sign, indicating the battery is taking charge. However, if it feels excessively hot to the touch, that's a problem—it could be due to battery aging, improper charger settings, or internal short circuits causing abnormal heating. High ambient temperatures can also worsen the heating, such as charging under direct sunlight in summer. It's advisable to charge in a well-ventilated area and ensure the charger voltage matches the battery specifications. If severe overheating occurs, stop charging immediately, allow the battery to cool, and seek professional inspection to prevent battery damage or even fire hazards. Regular maintenance can extend battery life and reduce malfunctions.

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