This TOSHIBA Satellite 1135-S155, 1135-S156 Replacement Battery Pack is 100% compatable with the PA3251U-1BRS TOSHIBA Satellite 1135-S155, 1135-S156 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 1135-S155, 1135-S156 Replacement Battery Pack includes a warranty to guarantee that it has no manufacturing defects.