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