Hipower 9 Cell Laptop Battery For Dell Studio 1537, 1555, 1557, 1558 Laptop Notebook Computers Battery Cells: 9 Cells Volts: 11.1V Capacity: 6600mAh; 73Wh Item 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. Item Size: 11.20in X 1.97in X 1.48in (285mm X 50mm X 38mm)