Hiport Laptop Battery For Acer Extensa 4620-4605, 4620-4648, 4620-4691, 4620-4908 Laptop Notebook Computers Cells: 9 Cells Volts: 11.1V Capacity: 6600mAh; 73Wh Type: This item is an extended capacity 9 cell battery. This battery is physically larger than batteries with fewer cells. Please compare the specs to determine if this battery will be larger than your original.