First of all, make sure that your battery is not a drum soul hall? Was it bad before that or was it overdone?
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3, in the best case, the electrochemical reaction rate of the battery can calmly provide enough electricity. The battery case does not heat abnormally, and the battery capacity is too high.
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The reason why the battery is hot when charged is that during the charging process, part of the electrical energy is converted into chemical energy, and the other part is also converted into energy such as heat energy. It is normal for the battery to heat up, but when the temperature is high, check whether the charging current is too high or the battery is short-circuited. Battery aging, electrolyte drying, internal short circuit, etc., will cause the battery heat.