The 
Rebel HPA Micro 7.4v 300mAh LiPo Battery
 is a high-performance, ultra-compact power source specifically designed for airsoft High-Pressure Air (HPA) systems. It is primarily used to power HPA Fire Control Units (FCUs) and regulators, fitting easily into tight spaces such as pistol grips, buffer tubes, and PDW stocks. 
 
Technical Specifications
Battery Type: Lithium Polymer (LiPo).
Voltage: 7.4V (2S configuration).
Capacity: 300mAh.
Discharge Rate: 35C continuous (provides rapid trigger response).
Connector Type: JST (compatible with most HPA systems like PolarStar and Wolverine).
Dimensions: Approximately 17mm x 11mm x 45mm.