BuyBatts 9 Cell Battery Fits Dell Studio XPS 16, 1640, 1645, 1647, PP35L, 312-0815, 451-10692, W303C, X411C. Notebook Laptop Portable Computer Replaces standard 6 cell battery with longe run time Item 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. Capacity Rating: 6600mAh; 73Wh Voltage Rating: 11.1V Cell Count: 9 Cells