The Valken 7.4V 250mAh HPA LiPo airsoft battery is specifically designed to power HPA engines. This airsoft gun battery uses a JST style connector, and they also come with a XH 3-pin charging connector. The Lipo airsoft battery fits into compact spaces with ease, and it can hold a charge for months.
 
Specifications
Configuration: Brick (2 Cells)
Dimensions: 42mm x 23mm x 12mm
Compatibility: For use with Valken V12 Engine / Wolverine Inferno Engine / PolarStar Fusion Engine
Plug type: JST
Charging plug type: BMS / XH 3-Pin Charging Connector
Specifications: 7.4v / 250mAh
Output: 25C
Charger: Not Included