Patent ID: 7619536

Claim:
A battery residual quantity display method in an electronic equipment including: an equipment body within which a microcomputer having communication function is mounted; and a battery pack detachably loaded at the equipment body and adapted so that a microcomputer having communication function to perform serial communication to and from the microcomputer of the equipment body is mounted, the battery pack serving to supply power to the equipment body, the method comprising: acquiring by serial communication by the microcomputer of the equipment body side information for battery residual quantity display from the microcomputer of the battery pack side loaded at the equipment body to perform battery residual quantity display on the basis of the acquired information when the power is turned on, the microcomputer acquiring the information for battery residual quantity display even if authentication processing is being performed by the microcomputer; acquiring by the microcomputer of the equipment body side, by serial communication, information for the authentication processing from the microcomputer of the battery pack side loaded at the equipment body to perform authentication processing to judge on the basis of the acquired information as to whether or not the battery pack connected to the equipment body is genuine battery pack; and updating by the microcomputer of the equipment body side, after the authentication processing, the content of battery residual quantity display on the basis of information for battery residual quantity display, which is acquired by serial communication from the microcomputer of the battery pack side.