Substitute battery pack including a case to accommodate a smaller battery type with an induction coil to facilitate charging

A battery pack that replaces AA batteries in an electronic device, wherein a battery compartment of the electronic device accepts a plurality of size AA batteries loaded in parallel orientation;

• wherein the battery pack comprises:
• a battery casing having an outline that allows insertion of the battery casing in a detachable manner in the battery compartment of the electronic device;
• at least one cylindrical battery housed in the battery casing, the at least one cylindrical battery being narrower than a size AA battery, the at least one cylindrical battery having an axial end surface and a side surface which is perpendicular to the axial end surface;
• a rear surface plate, integrally connected to the battery casing, for closing an opening of the battery compartment of the electronic device in a state of being mounted to the electronic device;
• a battery holder disposed between the rear surface plate and the at least one cylindrical battery, wherein the battery holder is in contact with the side surface of the at least one cylindrical battery so as to define a positioning of the at least one cylindrical battery;
• an induction coil arranged on the rear surface plate;
• and
• a circuit board that is disposed between the rear surface plate and the side surface of the at least one cylindrical battery, the circuit board being connected to the at least one cylindrical battery and receiving electric power by the action of electromagnetic induction from an external battery charger stand and charging the at least one cylindrical battery,
• wherein the battery holder comprises a first surface and a second surface being opposite to the first surface,
• wherein the at least one cylindrical battery is disposed on the first surface of the battery holder, and the induction coil is disposed between the rear surface plate and the second surface of the battery holder,
• and wherein the battery holder is arranged so as to divide a space in which the at least one cylindrical battery is disposed from a space in which the induction coil is disposed.