Main Battery Pack This is a 12 cell Nickel Cadmium rechargeable battery for Compudyne 3SL/25, 3SXL/25, 4DX/33, 4SX/33, 486DX33, 4DX2/66, 4DX2/66M series laptop and notebook computers. This ENERGY+ item is built with the highest quality standards, safety features and has a 12 month warranty. Assembled in the USA