Small Raven-compatible battery for powering the altimeter and the deployment charges. Battery capacity and ranges from 130mAhrs to 160 mAhrs, and the original brand may vary. No cell protection is built in, which allows full current to fire the deployment charges. The MCX connector is compatible with all Featherweight av-bays, including the Power Perch, 38mm, 29mm and 24mm av-bays. Note that the higher-capacity versions of this battery are longer, which may require modification to, or removal of, the wooden battery restraints provided in the 29mm and 38mm av-bays.