2x Pack - Replacement Battery for Sony BP-HP550 Headphone (700mAh, 1.2V, NI-MH) - Compatible with BP-HP550, 1-756-316-21, 1-756-316-22, BF-TDSY, MDR-DS3000, MDR-IF240RK, MDR-IF3000, MDR-IF540RK, MDR-RF820, MDR-RF885RK, MDR-RF920RK, MDR-RF960R, MDR-RF960RK Replacement Battery for Sony BP-HP550, 1-756-316-21, 1-756-316-22, BF-TDSY, MDR-DS3000, MDR-IF240RK, MDR-IF3000, MDR-IF540RK, MDR-RF820, MDR-RF885RK, MDR-RF920RK, MDR-RF960R, MDR-RF960RK Battery Capacity: 700mAh, Voltage: 1.2, Type: Nickel-Metal Hydride Lifetime Warranty On Sale for a Limited Time! Grade A Quality. High Capacity.