This IBM ThinkPad 385, 385D, 385ED CR1220 Size Lithium Coin Cell is 100% compatable with the CR1220 IBM ThinkPad 385, 385D, 385ED CR1220 Size Lithium Coin Cell. 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 385, 385D, 385ED CR1220 Size Lithium Coin Cell includes a warranty to guarantee that it has no manufacturing defects.