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

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It is normal for a newly replaced battery to get hot while charging. Reasons why the battery heats up during charging: During charging, the battery's charging current is generally high, causing the electrolyte inside to heat up and boil, which results in some temperature rise—this is normal. Additionally, the battery itself has internal resistance, and the passage of current naturally generates heat. If the battery becomes excessively hot (to the point of being too hot to touch), it may be due to improper charging practices or a potential issue with the battery itself. This can lead to water loss in the battery, shortening its lifespan. Precautions during charging: A car battery getting hot during charging will not explode, but it can damage the battery. This may be caused by severe sulfation or overcharging, in which case charging should be stopped immediately, and the sulfation should be addressed promptly. Typically, charging takes about 8-10 hours. If using a low current, it may take around 12 hours to fully charge. However, it is important to note that you should not wait until the battery is completely drained before charging. It is recommended to charge when the remaining battery level is around 70%, as this usually takes only 6-8 hours to fully charge. Avoid overcharging.