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Need a battery for HP Laptops/Notebooks with the following model numbers: HP Elitebook 2530P, 2540P; HP Compaq 2400, 2510P; HP 2533T Mobile Thin Client? 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 581191-121, 586595-241, 593585-001, 593586-001. 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.