Hqrp Portable Cd/Md / Mp3 Battery for Sony Nc-5wm / Nc5wm / Nc-6wm / Nc6wm Wm-701c 1-528-231-11 Wm-rx707 Wm-f100 Wm-fx675 WM-GX674 WM-EX610 WM-EX511 WM-EX618 + Coaster HQRP&reg; Replacement 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! Compatible Models: Sony NC-5WM / NC5WM / NC-6WM / NC6WM 1-528-231-11 WM-RX707 WM-F100 WM-FX675 WM-GX674, WM-EX5 WM-EX610 WM-EX511 WM-EX618