Any way to disable charging while the phone is on external power?

[IM0001]

I just got a new Mount to put my phone in while riding my motorcycle. The problem I have now is it is a waterproof mount... and also an almost heat proof one as well. I can charge my phone while riding but I have the problem of the phone overheating causing it to stop charging and pretty much nullifying using the phone while riding (for music, GPS, answering calls, etc. She just gets too hot)

I was wondering if anyone has found a way to disable the charging part so that the phone can stop heating up the battery while using the radios and such? My old X50v was able to run with no battery but as of yet the TP still needs one at all times. I am looking into modifying the mount to have a little ventilation but I don't want to make it useless waterproof wise as every long trip I am on it seems I get stuck in a rainstorm at one point or another.