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Do NOT let the battery heat up like that when you pull the trigger.
You either have an electrical problem, which is shortwiring the battery, the good thing, or a mechanical problem, IE seized gearbox, which is a bad thing. Whatever you do, stop holding down the trigger and get it looked at.
Since there isn't any weird noises mentioned, I assume it's the first, but either way, you need to get it checked out.
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