HQRP Portable CD/MD / MP3 Battery for SONY NH-10WM NH10WM MZ-E520 MiniDisc Player plus Coaster HQRP&reg; Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 1.2V; Capacity: 1450 mAh; Ni-Mh; Rechargeable up to 1000 times; Compatible with Original Battery; 200 Days warranty!