Uniden BT-905 Replacement Rechargeable Battery For many Uniden Phone Systems and Cordless Handsets, Nickel Metal Hydride Rechargeable Battery, DC 3.6V 600mAh Not a "knock-off" or "reproduction", it's the real thing with Uniden quality, reliability, and long life The same battery Uniden installed at the factory For many Uniden Phone Systems and Cordless Handsets (see description) Reliable and long lasting Nickel Hydride composition DC 3.6V, 600mAh