Puwda T420 9-Cell 11.1V 87Wh Replacement Laptop Battery For Lenovo IBM ThinkPad T410 T420 T510 T520 L410 L510 L520 E420 E520 Battery type: Li-ion; Voltage: 11.1V; Capacity:7800mAh/87Wh; Color: Black High Capacity Battery 55++; 9 Cell Extended Life Batteries will stick out of the battery compartment by 1 inch. Fit laptop models: ThinkPad E420 E520 T410 T420 T510 T520 W510 W520 Compatible P/N: 42T4708 / 42T4709 / 42T4710 / 42T4799 / 42T4801 / 42T4803 Free shipping; Arrives in 5-10 days.