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 SONY VAIO CA Series SONY VAIO CB Series SONY VAIO EG Series SONY VAIO EH Series SONY VAIO EJ Series SONY VAIO EL Series SONY VAIO VPCCA Series(All 2011 modle) SONY VAIO VPCCB Series(All 2011 modle) SONY VAIO VPCEG Series(All 2011 modle) SONY VAIO VPCEH Series(All 2011 modle) SONY VAIO VPCEJ Series(All 2011 modle) SONY VAIO VPCEL Series(All 2011 modle)