CWK HIGH PERFORMANCE Extended Battery for HP EliteBook 8440P 8440W ProBook 6545b 6700b - 9 Cell 24 Months Warranty 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!