Original battery Model : IBM 02K6620, 02K6621, 02K6626, 02K6627,02K6649,02K6857, 02K6858,02K6859,02K7025, 02K7026,02K7027,02K7028, 02K7029,02K7030,02K7032 08K8026 Battery Type: Lithium-ion Volts: 10.8V Capacity: 4000mAh Dimensions: 141.50x84.80x22.00 mm Fit Models: (Machine Models) IBM: ThinkPad T20 ThinkPad T20 2647-XXX ThinkPad T20 2648-XXX ThinkPad T21 ThinkPad T21 2647-XXX ThinkPad T21 2648-XXX ThinkPad T22 ThinkPad T22 2647-XXX ThinkPad T22 2648-XXX ThinkPad T23 ThinkPad T23 2647-XXX ThinkPad T23 2648-XXX