be careful
I once had a phone battery short out while the phone was in my trouser pocket, and to say the result was warming would be an understatement.
I managed to get the battery out of the phone before it burst into flames, but if I'd left it any longer I think I would have been faced with a very challenging situation
(I was actually in WH Smiths at the time, in a queue waiting to pay and had to run for the door, arms full of unpaid shopping with store security chasing me as I tried to get the phone apart before it burst into flames....)