HQRP Portable CD/MD / MP3 Battery Compatible with Sony NH-14WM / NH14WM / NH-14WM(A) WM-EX921 Replacement Plus Coaster HQRP&reg; Rechargeable Battery Replacement 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! Compatible With: SONY NH-14WM / NH14WM / NH-14WM(A) Replacement WM-EX921