Hi there. I was flying my Calypso this weekend, and ran into an interesting phenomena. The lipo I was using was a new 1300 mah 3s, it came with the plane, and was fully charged when I put it in the plane. I flew for quite a while, and suddenly noticed that when I gave it throttle, the propeller turned, but with no force. It couldn't have been more than two or three revolutions per second. I landed the plane, and plugged in a hobby king voltage checker, and found that I was at 3.5 volts. That's low, but just about everything I read online suggests that 3.3 volts is the magic number for low voltage. What am I missing?