1 × 3.7V 1200mAh 1S Li-ion RC Battery (SM 2P plug). Capacity: 1200mAh. SM 2P plug connector ensures wide compatibility. Cylinder 18650 Battery Size Connector: SM 2P Plug. Compatible with wide range of small scale RC toy cars (e.g., 1/18, 1/20,1/24 ), bumper car, stunt cars, fighting robots, monster truck.