ExpertPower 7.2v 2000mAh NiMh Replacement Battery for Ryobi 1311145 1400668 battery for HP61K, HP721, HP721K, RY721, RY721K2 Brand New | NiMh | 7.2 Volts | 2000 mAh | Black Only Charge with Ryobi 4400100 AC Adapter. ExpertPower batteries are made with high quality materials and tested to match and/or exceed OEM specs. Products trademarked ExpertPower are marketed and sold exclusively by ExpertPower. 1 Year Warranty