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Need a battery for HP Laptops/Notebooks with the following model numbers: HP Envy 15, Envy 15-1000, Envy 15T? BTI has you covered with our premium cell battery. This product has been engineered to meet or exceed the original manufacturer's specifications and replaces the original HP part numbers NK06, 570421-171, 576833-001, 586025-001, HSTNN-IB0I, HSTNN-Q42C. 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.