go to a school gym and fly. And arn't the GWS 11.1 1250mah batteries only like 25 bucks? So if you overdischarge them its not like you ruined a 250.00 dollar pack... You could probally time your flights then fly with a timer and when it gets around the time of the battery dying land and see how much voltage is left. I think Im going to by a Blade CP to learn to fly inverted before I buy the BTCP rotor head for my corona. Parts are probally cheaper for crashes and less damage would be done to the 350gram micro over a heli that weighs several pounds..