Warranty 1 Year Voltage 11.1V Battery Type External Cells 6 Cell Cell Type Li-ion 18650 cell Battery Capacity 4000mAh Watt-Hour 44Wh Compatible with Thinkpad Edge E430, Thinkpad Edge E430-3254xxx, Thinkpad Edge E430-6271xxx, Thinkpad Edge E430C, Thinkpad Edge E430C-3356xxx, Thinkpad Edge E435, Thinkpad Edge E435-3256xxx, Thinkpad Edge E435-3269xxx, Thinkpad Edge E530, Thinkpad Edge E530-3259xxx, Thinkpad Edge E530-6272xxx, Thinkpad Edge E530C-3366xxx, Thinkpad Edge E535, Thinkpad Edge E535-3260xxx ,Thinkpad Edge E540