This is a 56 WHr 6 Cell Original Lithium-Ion Battery for XPS M1530 Compatible Notebook Models: XPS: M1530 Dell Part Numbers: TK330, RU028, 0RU028 XT828, 312-0663. Product Specifications: Rating: 11.1V Capacity: 56WH Size: Color: Black Cell: 6 Cells Technology: Lithium-Ion Contacts: 9 Position Condition: Brand New In Stock: Yes