Please check compatibility before purchasing. Compatible part numbers: FRU 42T4702 FRU 42T4704 FRU 42T4706 FRU 42T4708 FRU 42T4710 FRU 42T4712 FRU 42T4714 FRU 42T4731 FRU 42T4735 FRU 42T4737 FRU 42T4751 FRU 42T4753 FRU 42T4755 FRU 42T4758 FRU 42T4791 FRU 42T4793 FRU 42T4795 FRU 42T4797 FRU 42T4799 FRU 42T4801 FRU 42T4803 FRU 42T4817 FRU 42T4819 FRU 42T4848 FRU 42T4851 FRU 42T4853 FRU 42T4925. Compatible with ThinkPad SL410 series ThinkPad SL510 ThinkPad E40 ThinkPad L410 ThinkPad L410 L412 L420 L421 L510 L512 L520 T410 T410i T420 T420i T510 T510i T520 T520i ThinkPad T510 4339 4349 4384 4484 and 4873. Designed For :Compatible with ThinkPad SL410 series ThinkPad SL510 ThinkPad E40 ThinkPad L410 ThinkPad L410 L412 L420 L421 L510 L512 L520 T410 T410i T420 T420i T510 T510i T520 T520i ThinkPad T510 4339 4349 4384 4484 and 4873.Model Name :Compatible part numbers: FRU 42T4702 FRU 42T4704 FRU 42T4706 FRU 42T4708 FRU 42T4710 FRU 42T4712 FRU 42T4714 FRU 42T4731 FRU 42T4735 FRU 42T4737 FRU 42T4751 FRU 42T4753 FRU 42T4755 FRU 42T4758 FRU 42T4791 FRU 42T4793 FRU 42T4795 FRU 42T4797 FRU 42T4799 FRU 42T4801 FRU 42T4803 FRU 42T4817 FRU 42T4819 FRU 42T4848 FRU 42T4851 FRU 42T4853 FRU 42T4925 ~Model Number :42T4708 42T4709 42T4710 Laptop Battery for Lenovo ThinkPad L410 L412 L420 L421.Feature 1 :Battery Use Tip: 1. if it possible then remove a charged battery when your device is plugged in. 2. If possible then try to use energy - saving settings on your electronics. 3. Charge fully your new lithium - ion battery for the first three cycles. 4. Avoid exposure to extreme temperatures also your battery can die if there will to fast temperature changes from low to high. 5. Always use the proper ac adapter charger for your device.