This replacement BYD H-AAA 550x2 Ni-MH battery pack is 2.4V 550mAh NiMH (Nickel Metal Hydride). The BYD H-AAA 550x2 Ni-MH battery pack was fitted in a variety of cordless phones. The BYD H-AAA 550x2 is a battery pack with two wires and a plug. Please check this plug is the same as the one on your battery.