Puredick&reg; NEW Replacement laptop Battery for Dell Alienware M11x M11x R1 R2 R3 Series M14X M14X R1 R2 PT6V8,8P6X6 08P6X6 KR-08P6X6 -12 Months Warranty[Li-ion 8-cell 14.8V 4200mAh] Battery Type: Li-ion || Voltage: 14.8V || Capacity: 4200mAh || Cells: 8-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.