Kastar 3-Pack BP-HP550-11 2.4V 1000mAh Ni-MH Battery Replacement for Sony MDR-RF840RK MDRRF840RK MDR-RF840RJ MDRRF840RJ MDR-RF850 MDRRF850 MDR-RF850RK MDRRF850RK MDR-RF860 MDRRF860 Headphone

Warm Reminder: Can use Ctrl + F easily to find your models 1. Compatible with the following Sony battery models: Sony BP-HP550-1 BPHP5501 Sony BP-HP550-11 BPHP55011 2. Compatible with the following Sony headphone models: Sony MDR-IF245RK MDRIF245RK Sony MDR-RF4000 MDRRF4000 Sony MDR-RF4000K MDRRF4000K Sony MDR-RF4000RK MDRRF4000RK Sony MDR-RF4000-1 MDRRF40001 Sony MDR-RF810 MDRRF810 Sony MDR-RF810RK MDRRF810RK Sony MDR-RF840 MDRRF840 Sony MDR-RF840RK MDRRF840RK Sony MDR-RF840RJ MDRRF840RJ Sony MDR-RF850 MDRRF850 Sony MDR-RF850RK MDRRF850RK Sony MDR-RF860 MDRRF860 Sony MDR-RF860RK MDRRF860RK Sony MDR-RF925 MDRRF925 Sony MDR-RF925RK MDRRF925RK Sony MDR-RF970 MDRRF970 Sony MDR-RF970RK MDRRF970RK