CWK 7800mAh 9 Cell Capacity Battery for Lenovo IBM FRU 42T4755 42T4795 42T4819 Lenovo ThinkPad E40 E50 T410 T410I T420 T510 SL410 SL510 IBM Lenovo IBM 42T4235 42T4731 42T4733 42T4737 42T Condition: Brand New - Grade A cells Battery Type: Li-ion Voltage: 10.8 Volt (11.1 Volt compatible) Capacity: 7800mAh (Better than 6600mAh) 90 Day Money Back. Buy with confidence!