Puredick New Laptop Battery for Dell Precision M6400 M6500, fits C565C G102C F678F KR854 8M039 5K145 DW554 P267P -12 Months Warranty[Li-ion 9-cell 11.1V 90Wh] Battery Type: Li-ion || Voltage: 11.1V || Capacity: 90Wh || Cells: 9-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.