Puredick High Performance Battery for Dell Alienware M15X, F681T, 0F681T, W3VX3, 0W3VX3, T780R, 0T780R -12 Months Warranty[Li-ion 6-cell 11.1V 4400mAh] Battery Type: Li-ion || Voltage: 11.1V || Capacity: 4400mAh || Cells: 6-cell 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. CE-/FCC-/RoHS certificated for safety,12 months warranty,professional technical support, efficient and always satisfied customer service 24 x 7 email support. Operation time:Same Battery life with Brand new original Dell battery.In reality, this will depend on the amount of electricity required by the device and how you use it.