I timed one of my flights on my Ultrafly Outrage and I flew it for 16 minutes before the ESC did the low battery cutout. This was with a 900 mah 3-S Thunderpower li-po powering a e-flite 370 outrunner 1050 KV motor and APC 8x3.7 electric prop. Generally I land because I'm tired of flying it, not because the battery is dead. I was flying it normally, not milking it for maximum flight time, but I never do use full throttle all the time, even with glow engines.