I had my 650 mah ego-c (non twist) charging in my truck. It had been charging for several hours and the red light was still on so I picked it up to check it. Wow is it hot! Even after it being disconnected from the charger for almost an hour it's still super hot. I'm assuming it was over charged. Should I be worried? Is my battery ruined? Will it blow up in my face? It seems to work fine...