Warranty 1 Year Voltage 10.8V Battery Type External Cells 6 Cell Cell Type Li-ion 18650 cell Battery Capacity 4000mAh Watt-Hour 43.2Wh Compatible with T410/T410i?T420/T420i, T430/T430i, T510/T510i, T520/T520i, T530/T530i, W510?W520, W530, L410?L412?L420?L421?L430?L510?L512?L520?L530 ,SL530,W530I,ThinkPad E40,ThinkPad E50,ThinkPad Edge 0578-47B,ThinkPad Edge 14",ThinkPad Edge 14" 05787UJ,ThinkPad Edge 14" 05787VJ,ThinkPad Edge 14" 05787WJ,ThinkPad Edge 14" 05787XJ,ThinkPad Edge 14" 05787YJ,Thinkpad Edge 14" 0578F7U,ThinkPad Edge 15",ThinkPad Edge E420,Thinkpad Edge E425,ThinkPad Edge E520,ThinkPad Edge E525,ThinkPad L410,ThinkPad L412,ThinkPad L420,ThinkPad L421,ThinkPad L510,ThinkPad L512,ThinkPad L520,ThinkPad SL410 2842,ThinkPad SL410 2874,ThinkPad SL410 series,ThinkPad SL410k 2842,ThinkPad SL510 2847,ThinkPad SL510 2875,ThinkPad SL510 series,ThinkPad T410,ThinkPad T410i,ThinkPad T420,ThinkPad T510,ThinkPad T510i,ThinkPad T520,ThinkPad T520i,ThinkPad W510,ThinkPad W520