usongs Zippy Compact 4000mAh 2S 7.4V 25C 35C Lipo Battery Pack RC HXT 4mm USA Spec. . Capacity: 4000mAh . Voltage: 2S1P / 2 Cell / 7.4V . Discharge: 25C Constant / 35C Burst . Weight: 197g (including wire, plug & case) . Dimensions: 145x14x43mm . Balance Plug: JST-XH . Discharge Plug: HXT 4mm .