This TOSHIBA T4500, T4500C, T4600, T4600C RTC Battery is 100% compatable with the VH1100AA-WR TOSHIBA T4500, T4500C, T4600, T4600C RTC 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 T4500, T4500C, T4600, T4600C RTC Battery includes a warranty to guarantee that it has no manufacturing defects.