Need a battery for HP Laptops/Notebooks with the following model numbers: DV1000, DV4000, ZE2000, ZT4000? BTI has you covered with our premium 6 cell LiIon battery. This product has been engineered to meet or exceed the original manufacturer's specifications and replaces the original HP part numbers PF723A, 367759-001; 396600-001. 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.