I broke the engine in on the ground in the plane and ran 12 tanks through it with an average run of about 25 minutes/tank. On the ignition there is a 2 cell lipo and it was down to 30% (about 3.78v/cell) at the end starting out fully charged(4.2v/cell) and it was about 20 degrees outside.
The receiver battery was just operating the throttle so I can't be of much help there. It is a 5 cell NiMh and at the end it was at 6.5 volts starting out at 7.1volts.
If I ever get the muffler manifold extension(Thanks Horizon !) I'll be able to flt it !