Then I took mine apart it seemed the battery was more towards the bottom than the top. But it is plausible the battery could cause bending. Seems odd though as the heat would be greater in the centre of the battery, not one corner.
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The previous one was left on charge constantly and the battery got so big that the sim slot which you can see in the second picture had bent up so far that you couldn't even see the slot, roughly about 2cm displacement.
The battery which is around 3" x 5" x 1" grew in height to around 3.5" from 1", it looked pretty insane.
As i've said before with the Samsung batteries, these are one of the worst for it, I service phones myself and i've seen a great deal of them and the habits of the end user are always the same, charge overnight and play a lot of crappy games like candy crush and the like.
Doing both at the same time will cause the phone to heat up and heat up, something somewhere has to give, it's quite well documented on the net in regards to bloat and overcharging.