HHR-P104: 3.6v 900mAh NiMH battery for Panasonic cordless — Batteries America
Amazon.com: 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 : Electronics