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Overcharging is a possibility. It would also become warm from a long period of cranking, such as if you have trouble starting the engine. What exactly does hot mean? Rather warm or "oh, there's a problem here!"? Overcharging is the most likely possibility, and if it is boiling off its electrolyte (the water inside the battery) and needs frequent top-ups then overcharging is the most likely answer. It could also become hot if there is an internal short circuit.

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