7.4v 2500mah Hump RX Lipo Uni Plug Receiver pack Hump type Chemistry: LiPo Capacity: 2500 mAh Voltage: 7.4V Connector: Universal Balancer: XH Sizes Length: 55mm Width: 31mm Height: 31mm Weight: 104g With a capacity of 2500mAh and a very precisely built semi-soft case these batteries will give you more runtime and more stable voltage throughout the race. The pack is available with the uni plug in a hump layout (NVO1504)