Kastar HHR-P104 Cordless Phone Battery, Ni-MH, 3.6 Volt, 1000mAh Ultra Hi-Capacity, Replacement for Panasonic HHR-P104 HHR-P104A and Sony MDR-RR800/900 Series Rechargeable Battery Kastar Battery Replacement for Panasonic HHR-P104 Battery Battery Type: Ni-MH; Battery Voltage: 3.6V Battery Capacity: 1000mAh Package Includes: 1 Battery Compatible with: Panasonic HHR-P104A and Sony MDR-RR800/900 Series Rechargeable Battery