Lithium-Ion batteries are longer lived than conventional batteries and do not require replacement as often. This 6-Cell Lithium-Ion Additional Primary Battery from Dell helps you power up your system for business trips and vacations. With a capacity of 56 WHr this battery lets you work seamlessly when you are on the move. This product has been tested and validated on Dell systems to ensure it will work with your computer. It is supported by Dell Technical Support when used with a Dell system.