GD Living' Replacement Battery for Sony MDR-RF4000- Sony BP-HP550-11

'GD Living' Replacement Battery for Sony MDR-RF4000 Capacity : 2.4V, 600mAh, 1.44 Wh, NI-MH. Warranty : 1 year. Batteries are certified by ISO9001, CE, RoHS, UN38.3, MSDS, and CO. Compatible with or replaces the following models : Sony BP-HP550-11, Sony MDR-840, Sony MDR-850RK, Sony MDR-970RK, Sony MDR-RF810, Sony MDR-840RJ, Sony MDR-860, Sony MDR-RF4000, Sony MDR-810K, Sony MDR-850, Sony MDR-860RK, Sony MDR-970, Sony MDR-4000RK, Sony MDR-RF4000K, Sony MDR-RF810RK, Sony MDR-RF840, Sony MDR-RF840RK, Sony MDR-RF850, Sony MDR-RF850RK, Sony MDR-RF860, Sony MDR-RF860RK, Sony MDR-RF970, Sony MDR-RF970RK.