Nickel Cadmium Cordless Phone Battery For UNIDEN BT-905 Is A Cordless Telephone Battery Used In Hundreds Of Different Uniden, Panasonic, At&T, V-Tech, Motorola And Toshiba Cordless Telephones Most Bt905 Batteries Are Rated At 3.6 Volts And Either 600 Or 700 Mah The Mah Number Is The Measurement Of The "Capacity" Of Your Bt-905 Battery Pack The Higher The Mili-Amp Hour Rating, The Longer Your Run Time Nimh Batteries Are Immune To "Memory Effect"