Top Race 2200mah 3s 11.1v 20c Rc Lipo Battery Trex 450 V2 3d Fly Minimum Capacity: 2200mAh Peak Discharge (10sec): 30C Constant Discharge: 20C This Li-Polymer battery is the best choice for 3D flyer of Trex 400/450 and other similar size helicopters Top Race product is made from high quality materials and designed for lasting performance