Patent ID: 7170257

Claim:
A card type device serving as a supplementary power supply device, comprising: a battery provided in a frame of the card type device to serve as a supplementary power supply to a host; a connector to connect to the host for an interfacing of power and data to and/or from the host; a battery charging/discharging circuit to charge the battery with an input power supplied via the connector, and to output the power of the battery via the connector; and a power input/output controller to provide the host with information of attributes of the battery during a connection to the host, with the power input/output controller to control the battery charging/discharging circuit so that the power of the battery is supplied to the host when a request for power supply is transmitted from the host, wherein the power input/output controller controls the battery charging/discharging circuit so that the battery is charged with the input power when the battery is completely discharged, the battery charging/discharging circuit is a smart battery circuit, the smart battery circuit provides the host with information of attributes of the battery via an address pin of the connector, and the information of the attributes of the battery, provided to the host, comprises at least one of a battery voltage, a battery remnant, battery charging times, a battery manufacturer, and a battery manufacturing period.