Brand new 9 cell replacement battery for Lenovo ThinkPad Edge T520, T420, E50 (42T4235, 42T4731) Specifications: Voltage: 11.1V Capacity: 6600mAh/73Wh Cells: 9 Colour: Black Suitable Models: Lenovo ThinkPad E40, E50, L410, L412, L420, L421 L510, L512, L520 SL410, SL410 2842, SL410 2874, SL410k 2842 SL510, SL510 2847, SL510 2875 T410, T410i, T420, T420i T510, T510i, T520, T520i W510, W510 4389, W520 Lenovo ThinkPad Edge 14", 14" 05787UJ, 14" 05787VJ, 14" 05787WJ, 14" 05787XJ, 14" 05787YJ, 15", 15? 301K7J E420, E425, E520, E525 NOT COMPATIBLE WITH Lenovo ThinkPad L430, L530, T430, T430i, T530, T530i, W530 Compatible part numbers: 42T4708, 42T4709, 42T4710, 42T4712, 42T4714, 42T4715, 42T4731, 42T4733, 42T4735, 42T4737, 42T4753, 42T4757, 42T4764, 42T4765, 42T4799, 42T4801, 42T4803, 42T4848, 42T5263, 51J0499, 51J0500, 57Y4185, 57Y4186, 57Y4545, ASM 42T4703, ASM 42T4711, ASM 42T4752, ASM 42T4756, ASM 42T4794, ASM 42T4796, 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 42T4791, FRU 42T4793, FRU 42T4795, FRU 42T4797, FRU 42T4799, FRU 42T4801, FRU 42T4803, FRU 42T4817, FRU 42T4819, FRU 42T4848, FRU 42T4851, FRU 42T4925, FRU 42T4927, 42T4235 What's in the box 1 x Replacement Battery