Lithium-Ion batteries are longer lived than conventional batteries & do not require replacement as often. This 3-Cell Lithium-Ion battery from Dell™ helps you power up your system for business trips & vacations. With a capacity of 28 WHr this battery lets you work seamlessly when you are on the move. This product has been tested & validated on Dell systems to ensure it will work with your computer & is compatible with Dell Notebook. It is supported by Dell Technical Support when used with a Dell system.