Exxact Parts Solutions Laptop Replacement Battery for Lenovo ThinkPad T410 T420 T510 T410i T520 SL410 SL510 W520 W510 E40 E50 Battery type: Li-ion; Capacity: 7800mah /86.5Wh; Cells: 9-cell; Voltage: 11.1V. Quality: Grade A cells ensure fast charges and low power consumption. Protection: Built-in circuit protection, overcharge protection, over voltage protection ensures both safety and stability. Safety: Worry-free, products are passed CE-/FCC-/RoHS-Certified.1 Year Warranty Guaranteed. Origin: 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery.Please feel free to contact us if you have further questions.We will be more than happy to assist you.