Composed of 3 of the specialized Nickel Cadmium 2/3 AA batteries, this battery pack is designed to replace an extensive assortment of battery packs from a plethora of brands including Lucent, GE, Nomad, RCA, AT&T and many more. Its NiCd chemistry allows the battery pack to hold a substantial charge, up to 400 mAh, and can deliver up to 3.6 Volts of power.