Panasonic HHR55AAABU Cordless Phone Battery Ni-MH, 1.2 Volt, 1000 mAh - Ultra Hi-Capacity - Replacement for 2 Rechargeable Batteries Replacement Batteries - Ni-MH, 1.2 Volt, 1000 mAh. This Battery is fully Compatible with the original battery 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark