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Need a battery for HP Laptops/Notebooks with the following model numbers: 311, Pavilion DM1? 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 572831-121, 580029-001, 586029-001, PT06, HSTNN-IB01, HSTNN-Q44C. 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.