Need a battery for HP Laptops/Notebooks with the following model numbers: ZX5000, ZV5000, ZD8000? BTI has you covered with our premium 12 cell LiIon battery. This product has been engineered to meet or exceed the original manufacturer's specifications and replaces the original HP part numbers DP390A. All BTI batteries are manufactured and tested under our stringent quality standards and come with an industry leading 18 month manufacturer's warranty. BTI... True to the original.