10.8V 57Wh 55+ SL410 Laptop Battery for Lenovo ThinkPad E40 E50 L410 L420 L510 L520 L412 SL510 T410 T510 T520 W510, ThinkPad Edge 14 15 E420 E425 E520 E525, 42T4791 FRU 42T4751 Type: Li-ion; Rating: 10.8V / 57Wh; Cell: 6; Color: Black Operation time: Around 2.5 hours, 500+ recharge cycles over ABS+PC materials: good gloss, smooth feel, anti-flammability, wear-resisting Warranty: 90 days money back, free exchange within 12 months Please check if this battery is compatible with your computer before purchasing, Part numbers of compatible batteries and Computers are listed as following