LQM 11.1V 94Wh/8.4Ah New Laptop Battery for Lenovo ThinkPad 55++ T410 T420 E420 T510 T510i T520 T520i W510 W520 57Y4186 42T4799 42T4798 Battery type:Li-ion Voltage:11.1V Capacity:94WH/8.4AH Replacement for For Thinkpad L410 L412 L420 L510 L512 L520 T410 T410i T420 T510 T510i T520 W510 W520 55++ Also fit 42T4853 42T4799 42T4912 12 Months Warranty,30 days money return guarantee