NiMH Hump Battery Pack 8.4V 3000 mAh Made of 7 SC NiMH 3000mAh rechargeable batteries with silicon wire and Tamiya connector No memory effectLong cycle life with rapidly charge.Ideal for Airsoft Gun, RC Racing Cars, Truck, Airplane, Boat and etc. Dimension: 135 x 38 x 45 mm Weight: 13.50 oz.