This TOSHIBA Satellite Pro M15-S405, M15-S406 Replacement Battery Pack is 100% compatable with the PA3259U-1BRS TOSHIBA Satellite Pro M15-S405, M15-S406 Replacement Battery Pack. Our batteries and accessories are made with high quality parts and are guaranteed to meet or exceed the original equipment manufacturers specifications at a reduced price. All batteries are tested for 100% quality control assurance. This TOSHIBA Satellite Pro M15-S405, M15-S406 Replacement Battery Pack includes a warranty to guarantee that it has no manufacturing defects.