The E7U24UT CM03XL Long Life Notebook Battery from HP has a thin design that integrates into the notebook to keep its profile sleek. This rechargeable battery is for select HP ProBook 800 series notebooks and HP Z Books. The 11.1V lithium-ion battery has a capacity of 4504mAh. It has a three-year life span to help lower your total cost of ownership. In addition, it reduces overall battery waste by using fewer batteries over the life of the notebook.