I ran a Nuprol 11.1 1450mAh 30C battery in it for approx 2.5years without issues, then stripped the gears and cracked the gearbox. Negative Airsoft redid the insides and now I run a 7.4 lipo in it for CQB mainly. He says I can run a 11.1 lipo but to make sure it's around 15C nor more than that.