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Need a battery for Sony Laptops/Notebooks with the following model numbers: Vaio TR1, TR2, TR3 series (extended capacity)? BTI has you covered with our premium 9 cell LiIon battery. This product has been engineered to meet or exceed the original manufacturer's specifications and replaces the original Sony part numbers PCGA-BP3T. 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.