This TOSHIBA T2200SX Resume Battery is 100% compatable with the P11AA-4WR TOSHIBA T2200SX Resume Battery. 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 T2200SX Resume Battery includes a warranty to guarantee that it has no manufacturing defects.