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I put mine in the freezer when it gets too hot. Hasn't hurt anything afaik
Also, calibrating it helps as well. Especially if you haven't since last flashing a rom.
The long-term storage thing is just a myth. batteries are not food, storing in a cool place is not going to improve battery life.
Sometimes my phone overheats while charging, so I remove the battery and let it cool in the freezer so I can go back to charging it