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Need a battery for Panasonic Laptops/Notebooks with the following model numbers: ToughBook 19 series, ToughBook CF-19 series (6-cells)? 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 Panasonic part numbers CF-VZSU48, CF-VZSU48U. 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.