When I got my T-Rex I bought 2 Apex 2100Mah batteries. Have about 20 or so flights on them. One pack is still flat on top and bottom, but the other looks a little bit swelled to me. It is still flat on one side, but the top of the pack looks like it has balooned up by just a bit to where it is slightly curved.

It does not seem to be getting any worse (it may have been like that from the start) The pack is not any hotter than the other when spent, nor does it get hot when charging. Should I stop using this pack and buy another? Or just keep using and monitor it closely for any additional swelling?

Thanks,
Pete