laptop battery pack replace for Lenovo Edge 420 e50 e525 thinkpad t420 t510 w520

• 42T4708
• 42T4709
• 42T4710
• 42T4712
• 42T4714
• 42T4715
• 42T4731
• 42T4733
• 42T4735
• 42T4737
• 42T4753
• 42T4757
• 42T4799
• 42T4801
• 42T4803
• 42T5263
• 51J0499
• 51J0500
• 57Y4185
• 57Y4186
• ASM 42T4703
• ASM 42T4711
• ASM 42T4752
• ASM 42T4756
• ASM 42T4794
• ASM 42T4796
• FRU 42T4702
• FRU 42T4710
• FRU 42T4751
• FRU 42T4755
• FRU 42T4791
• FRU 42T4793
• FRU 42T4795
• FRU 42T4797
• FRU 42T4799
• FRU 42T4801
• FRU 42T4803
• FRU 42T4817
• FRU 42T4819

• ThinkPad E40
• ThinkPad E50
• ThinkPad Edge 14"
• ThinkPad Edge 14" 05787UJ
• ThinkPad Edge 14" 05787VJ
• ThinkPad Edge 14" 05787WJ
• ThinkPad Edge 14" 05787XJ
• ThinkPad Edge 14" 05787YJ
• ThinkPad Edge 15"
• ThinkPad Edge E420
• ThinkPad Edge E425
• ThinkPad Edge E520
• ThinkPad Edge E525
• ThinkPad L410
• ThinkPad L412
• ThinkPad L420
• ThinkPad L421
• ThinkPad L510
• ThinkPad L512
• ThinkPad L520
• ThinkPad SL410
• ThinkPad SL410 2842
• ThinkPad SL410 2874
• ThinkPad SL410k 2842
• ThinkPad SL510
• ThinkPad SL510 2847
• ThinkPad SL510 2875
• ThinkPad T410
• ThinkPad T410i
• ThinkPad T420
• ThinkPad T510
• ThinkPad T510i
• ThinkPad T520
• ThinkPad T520i
• ThinkPad W510
• ThinkPad W510 4389
• ThinkPad W520

1 Cells: We use A Grade Cell, and 1 year warranty.

2 Battery Case: The battery case use insulation materials with shockproof, prevent aging, and no easy to damage. First-class and durability.

3 Mother Board: Battery motherboard is designed by ourselves. Special design include automatic protection programs, such as over-charge, over-discharge, over-heart and short circuit protection.

4 A series testing:

1) The first test is to inspect all the cells that whether have stable and ample capacity before assembly. The test time costs four hours.

2) The second test is to test the basic performances of the assembled battery before the aging test.

3) The Third test is aging test, to inspect basic parameters and performances. We do aging test for 72 hours.

4) The fourth test is to inspect all the performances of the battery after fixing procedure.

5) The last test is to inspect the battery whether can work well on laptop after finished all assembly procedures.

5 Low self-discharge: The residual capacity of our battery have more than 90% of the initial capacity after 30 days storage.

6 Charge-discharge can come up to more than 300 times, after 300 times, the residual capacity still have 80% of the initial capacity.

7 6 cells battery, the use time is up to more than 3 hours.