Hiport 9 Cell Laptop Battery For HP HP 644O Laptop Notebook Computers Cells: 9 Cells Volts: 11.1V Capacity: 8300mAh; 93Wh Type: This item is an extended capacity 9 cell battery. This battery is physically larger than batteries with fewer cells and may stick out from your computer when installed. Please compare the ratings to determine if this battery is different from your current battery.