This IBM PS/2 Model N45SL Resume Battery is 100% compatable with the KFA600-4SLE IBM PS/2 Model N45SL Resume 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 PS/2 Model N45SL Resume Battery includes a warranty to guarantee that it has no manufacturing defects.