A guy at work is just getting into planes and bought a used trainer off of CL. He mentioned that he charged the RX and the TX using the walwart and was ready to go. I convinced him to give me the RX pack to check and cycle with my RC car charger. Turns out he had a bad cell. My guess is the plane would of taken off and then gravity would take over. At one amp discharge, the pack dumped in 56 seconds on the charger. On the plane, It might of lasted 2-3 minutes IF it had enough power to make the first bank.