I've got a 1500 and tried it in the Axe. It will lift it, but it is struggling to haul all that weight in the air. The motor is much hotter after the flight. Has anyone tried the 1250 size battery? This would be better than the 910 as you would get longer flight times, but not weigh down the heli with battery. The weight would be closer to the Original battery and not create a tail heavy situation as the 910 would.