Extended Capacity Intelligent Battery Pack This is a 9 cell Lithium Ion rechargeable battery designed to work in IBM Thinkpad A20, A20m, A20p, A21, A21m, A21p, A22, A22m, A22p series laptop and notebook computers. This battery ships fully charged, tested and ready to work. This ENERGY+ item is built with the highest quality standards, safety features and has a 12 month warranty. Assembled in the USA