This TOSHIBA T3100SX Resume Battery is 100% compatable with the 5N220AAA TOSHIBA T3100SX 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 T3100SX Resume Battery includes a warranty to guarantee that it has no manufacturing defects.