This IBM ThinkPad T40 Series RTC Battery is 100% compatable with the CR2032-TPX IBM ThinkPad T40 Series 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 IBM ThinkPad T40 Series RTC Battery includes a warranty to guarantee that it has no manufacturing defects.