Fasa is dead on about the battery dieing. I've had it do so on me severaly times and not once was it fun. You can be in the middle of a torque roll and all the sudden, it drops, and when it does drop, even at full throttle it doesn't have enough power to stay airbourne, so you'll sorta end up harriering it in, lol. If you do push your flights until the battery dies, just make sure you are brushed up on dead stick landings, and make sure to have some altitude when your getting to the end of the battery, other wise it can be a little tough.