This IBM ThinkPad R51 Series 120W Car Cord is 100% compatable with the IB1207-10 IBM ThinkPad R51 Series 120W Car Cord. 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 R51 Series 120W Car Cord includes a warranty to guarantee that it has no manufacturing defects.