14.8 Volts - 3700 mAh - 54.8Wh 30-40 hours run time approximately* Charger included 4 hour charge time from dead to full charge ICOtec C4 Power House Rechargeable Lithium Battery & Charger. The C4 Power House was designed exclusively for the ICOtec Outlaw & Night Stalker Electronic Game Callers. *Battery consumption rate will vary based on; the volume, if constant play mode is used and if used in extremely low temperatures. The C4 is also a great power source for the Lucky Duck brand of calls. Manufactured for Sabre, Night Stalker, Outlaw, Renegade+, Night Stalker+ and Outlaw+