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 x200, x200s, x201, x201s x201i, x200 7454, x200 7458, x200 7454, x200 7465, x200s series, thinkpad x200s series, x201 3323