I still haven't taken it outside to fly. Still getting the hang of it indoors. I am seriously trying to get a motorcycle battery as I only have one li-poly battery and every time it drains out I have to wait for 1.5 hours before I can fly again. I have the tether cord. I am hoping that the big morotcycly batter will not destroy the circuity board. Anybody used to tether cord to learn to fly????