This IBM ThinkPad i Series (1100) 54WHr Portable Power Pack is 100% compatable with the PBASE-JR-IBM IBM ThinkPad i Series (1100) 54WHr Portable Power 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 i Series (1100) 54WHr Portable Power Pack includes a warranty to guarantee that it has no manufacturing defects.