6600mAh 9 cell Replacement for Dell XPS L521X Laptop Battery [Extended-Capacity] Battery Type: Lithium-ion (Li-ion) Voltage: 11.10V | Capacity: 6600mAh Rate: 73.00 Wh | No. of cell: 9 Weight: 496.40 g | Color: Black Condition: New, 1 year warranty! Please ensure the product(s) that you are going to buy fits the brand, model, part number and dimension (mentioned above) of your device.