HHR-P104 Battery, Type 29, NI-MH Rechargeable Cordless Telephone Battery 3.6V 1000mAh, Replacement for Panasonic HHR-P104, Dantona, Energizer, GE (Detail Models in The Description) Standard Batteries & Chargers - Newegg.com
2x Pkcell New Hhr-p104 Nimh Rechargeable Battery 3.6v 800mah For Panasonic Cordless Phone - Rechargeable Batteries - AliExpress
Best Buy: UltraLast Nickel Metal Hydride Batteries for Panasonic HHR-P104 (2-Pack) BATT-104-2