Panasonic KX-TG5100 Battery - Replacement for Panasonic Cordless Phone Battery (1200mAh, 3.6V, NI-MH) Replacement Panasonic KX-TG5100 Battery Replacement for Panasonic Cordless Phone Batteries Lifetime Warranty Capacity: 1200mAh, Upstart Battery Brand On Sale for a Limited Time!