I've found that with my blade and 1320 mah lipo, I don't need to worry about overdischarging, When it will no longer hover more than 3-4 feet high or so, the voltage always reads about 10.8. Obviously, its very easy for me to tell when the battery is getting low. Do you guys try to run your batteries down to that final inch of hover? If so, thats an easy way to ruin your lipos