Originally Posted by Manson
You should run with a timer like 5-6 min.
A lipo don t like to be full discharged. It may be cause your "puff"
3.9v is no where near low voltage cut off and even further from complete discharge.
I agree that it is more than likely too high a draw. Running on concrete/carpet provides alot of traction and will result in a higher draw than running on dirt or grass.
You seem to have decent batteries so this is kind of perplexing.... Were the lipos warm? How many cycles are on your batteries? Ever puffed before?