This IBM ThinkPad R51p Series Replacement Battery Pack is 100% compatable with the 08K8197 IBM ThinkPad R51p Series 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 IBM ThinkPad R51p Series Replacement Battery Pack includes a warranty to guarantee that it has no manufacturing defects.