◆ Battery specification: 100% brand new battery; voltage: 10.8 V; capacity: 7800 mAh 84.24 Wh; battery type: Li-ion. Number of cells: 9. (Real capacity: 7800 mAh.9 cells, the use of more cells means extended batteries, which can provide a higher capacity and a longer service life. ◆ Compatible with: Compatible Lenovo battery 42T4235 42T4708 42T4714 42T4733 42T4756 42T4764 42T4798 42T4803 42T4819 42T4848 42T4911. 51J0499 57Y4185 57Y4545 ASM 42T4703 42T4752 42T4794 42T4702.For Lenovo ThinkPad E40 E50 Edge 0578-47B Edge 14" 05787UJ d 14" 05787UJ d 14" 05777 87VJ 1 4" 05787WJ Edge 15" E420 E425 E520 L410 L412 L420 L421 L510 L512 L520 SL410 2842 SL410 2874 SL410k 2842 SL. 510 SL510 2875 SL510 T410 T410i T420 T510 T510i T520 T520i W510 W520 ◆ High quality and environmentally friendly: environmentally friendly Li-ion battery cells inside, contains no Pb / Hg / Cd, no pollution. No memory effect, can be charged or discharged as needed without loss of capacity, without the need for full charge or full discharge during operation, which is much more convenient. Up to 500 charging cycles over the life of the battery. ◆ Safe and reliable: Each battery has passed the test for incorrect voltage, short circuit, internal overheating, overcharging and over-discharge, safety insurance! ◆ Promise: If you have any problems, questions or concerns, please send us an email. We promise to fix the problem within 24 hours.