Alliboo 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-Polymer; Voltage: 14.4V; Capacity: 4200mAh; 8 Cell. 100% New from Manufacturer, High Performance; Dell Alienware M11x R1 R2 R3 M14x Series Replacement Battery. Overcharger and Discharger Circuit Protection, CE-/FCC-/RoHS-Certified for safety Operation time: Around 2.5 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. Warranty: 12 Months warranty, 30 days money return guarantee, 24 x 7 email support.