CWK 7800mAh 9 Cell New High Capacity Battery for Samsung AA-PB9NC5B AA-PB9NC6B AA-PB9NC6W AA-PB9NC6W/E NP-RV509 NP-RV509E NP-RV509I NP-RV520 NP-RV540 NP-RV720 RV509 RV413 NP-RV511 NT-RV511 Condition: Brand New - Grade A cells Battery Type: Li-ion Voltage: 11.1 Volt (10.8 Volt compatible) Capacity: 7800mAh (Better than 6600mAh) 90 Day Money Back. Buy with confidence!