EBK&reg; New Laptop Battery for IBM 42T4848 ASM 42T4796 Lenovo ThinkPad E40 E50 L410 L420 L510 L520 L412 L412 SL410 SL510 T410 T510 T520 W510 W520 ; ThinkPad Edge 14 15 E420 E425 E520 E525 ; fits P/N 57Y4186 42T4791 51J0499 42T4235