Patent ID: 8907618

Claim:
A cell apparatus which emits and receives AC power via magnetic field resonance coupling to an external device, comprising: a secondary cell; a cell interface to interface with the secondary cell; a first circuit to generate, by discharging the secondary cell in a discharging mode, a magnetic field to induce an AC current in the external device when the cell apparatus is inserted into a cell apparatus accommodating section of the external device, and to generate, in a charging mode to charge the cell, an AC current from a magnetic field received from the external device; a conversion circuit to generate, in the charging mode, a charge signal from the AC current generated in the first circuit, the conversion circuit supplying the charge signal to the cell interface; a frequency generator to generate, in the discharging mode, an AC current from a discharge signal received from the cell interface, the frequency generator supplying the AC current to the first circuit; an input device to receive a selection of the charging mode and the discharging mode; circuitry configured to generate a control signal based on the selection; and a switching circuit to couple, based on the control signal, the cell interface to the conversion circuit and the conversion circuit to the first circuit in the charging mode, and couple the cell interface to the frequency generator and the frequency generator to the first circuit in the discharging mode, wherein the cell apparatus accommodating section of the external device is formed in a hinge portion thereof to accommodate a single cell apparatus.