Abstract: A method for counting cycle count of a smart battery, a method and device for correcting full charge capacity of a smart battery, which is used as reference capacity for indicating correct remaining capacity of the battery, are disclosed. The present invention increase cycle count that is a standard for updating FCC in gradual floating variables in consideration of SOC to obtain continuous cycle count. FCC information is updated when the battery has been fully charged or the integer of the cycle count increases 1 using a predetermined FCC correction table in which FCC correction values varying with the cycle count are linearized by sections. This improves reliability in actually corrected FCC information and increases accuracy in the remaining capacity indicated on the basis of the FCC information.