A control circuit sets a detection period D1 in which the control circuit detects an output value of a solar cell and receives an optical signal, and charging periods C1, C2 in which a storage battery can be charged, during a reception period for receiving a data signal of transmission data transmitted from a communication target; controls a charging control circuit to disconnect the solar cell and the storage battery, and causes a detection circuit to detect the output value of the solar cell, during the detection period D1; and controls the charging control circuit to connect the solar cell and the storage battery during the charging periods C1, C2.

An electronic device that has a secondary battery and a controller which receives power supply from the secondary battery so as to perform a drive control on one or other multiple circuits driven by receiving the power supply from the secondary battery includes an initializing unit that starts processing for outputting an initializing signal to instruct the controller to perform initializing at predetermined timing, in response to a starting point in which a voltage of the secondary battery becomes equal to or lower than a first threshold voltage which is set to be higher than an operation-guaranteed voltage of the controller and a lower state thereof continues for a predetermined period of time.

An electronic device that has a secondary battery and a controller which receives power supply from the secondary battery so as to perform a drive control on one or other multiple circuits driven by receiving the power supply from the secondary battery includes an initializing unit that starts processing for outputting an initializing signal to instruct the controller to perform initializing at predetermined timing, in response to a starting point in which a voltage of the secondary battery becomes equal to or lower than a first threshold voltage which is set to be higher than an operation-guaranteed voltage of the controller and a lower state thereof continues for a predetermined period of time.

An auxiliary electronic device attachable to a wearable electronic device. The auxiliary device includes a housing, electronic circuitry within the housing, and an attachment mechanism configured to attach the auxiliary electronic device to the wearable device while the device is being worn by a user. In some embodiments the electronic circuitry includes a power transmitting unit that can wirelessly transmit power to charge a rechargeable battery within the wearable electronic device. In some embodiments the attachment mechanism includes a pair of lugs that extend, from opposite ends of the housing, above the housing towards a center of the auxiliary device and are adapted to fit within corresponding recesses of the wearable electronic device.

An auxiliary electronic device attachable to a wearable electronic device. The auxiliary device includes a housing, electronic circuitry within the housing, and an attachment mechanism configured to attach the auxiliary electronic device to the wearable device while the device is being worn by a user. In some embodiments the electronic circuitry includes a power transmitting unit that can wirelessly transmit power to charge a rechargeable battery within the wearable electronic device. In some embodiments the attachment mechanism includes a pair of lugs that extend, from opposite ends of the housing, above the housing towards a center of the auxiliary device and are adapted to fit within corresponding recesses of the wearable electronic device.

The present invention provides a watch type mobile terminal which comprises: a body; a first wireless communication unit installed in the body; a band connected to the body and wound on a user's wrist; a first battery installed in the body or the band; a wireless audio module mounting unit formed on the band and having a concave shape; and a wireless audio module which can be attached to or detached from the wireless audio module amounting unit, wherein the wireless audio module comprises: a housing; an audio output unit installed in the housing; a second wireless communication unit installed in the housing; and a second battery installed in the housing and receiving power supplied from the first battery.

The present invention provides a watch type mobile terminal which comprises: a body; a first wireless communication unit installed in the body; a band connected to the body and wound on a user's wrist; a first battery installed in the body or the band; a wireless audio module mounting unit formed on the band and having a concave shape; and a wireless audio module which can be attached to or detached from the wireless audio module amounting unit, wherein the wireless audio module comprises: a housing; an audio output unit installed in the housing; a second wireless communication unit installed in the housing; and a second battery installed in the housing and receiving power supplied from the first battery.

A solar panel includes a plurality of solar cells. Each of the solar cells includes a plurality of power generation regions, and connection regions that connect the plurality of power generation regions and have a lower power generation capacity than the plurality of power generation regions. A plurality of power generation functional units are formed in which the connection regions are disposed adjacent to each other.

A solar panel includes a plurality of solar cells. Each of the solar cells includes a plurality of power generation regions, and connection regions that connect the plurality of power generation regions and have a lower power generation capacity than the plurality of power generation regions. A plurality of power generation functional units are formed in which the connection regions are disposed adjacent to each other.

The present disclosure relates to a smart watch including a watch dial. The smart watch further include: a battery provided in a watch frame of the watch dial to supply electric power to a circuit in the watch dial. According to the present disclosure, by providing batteries in the watch frame and the watchband of the smart watch, spaces occupied by the watch frame and the watchband may be sufficiently utilized to increase total electricity storage capacity of the smart watch such that the smart watch has a prolonged standby time.