Shrink-wrapped barrel-shaped battery (made of three stacked cylindrical cells) with two wires and two pin connector. 3.6 Volt NiCad Battery. Fits models; AT&T 386SX, Laser Pal 386SX, Leading Technology 386SX, Mitsubishi 386SX, Northgate 386SX/20,Siemens 386SX/20, Unisys 386SX