Puredick&reg; High Capacity Laptop Battery for Dell Latitude E6400 E6410 E6500 E6510 Precision M2400 M4400 M4500 Battery Pt434 Notebook Laptop Battery P/n: Pt434, Pt435, Pt436, Pt437, Ky265, Ky266, Ky268, Fu268, Fu274, Fu571, Mn632, Mp303, Mp307, Nm631, Nm633, W1193, Ky477 C719r 312-0748 312-0917 Notebook Computer Battery -12 Months Warranty (Li-ion 9-cells 11.1v 7800/86Wh) Battery type: Li-ion; Capacity: 7800/86Wh; Cells: 9-cell; Voltage: 11.1V. 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