System comprising electronic device and battery charging device, and operation method therefor

An operation method of an electronic device, the method comprising:

• moving to a second electronic device including a second battery when a remaining capacity of a first battery disposed on a side of a housing of the electronic device in a first slot opening in a first direction toward which a side of the housing faces is less than or equal to a threshold value;
• when it is detected that the second battery is electrically connected with the electronic device, changing a power source of the electronic device from the first battery to the second battery;
• and
• separating the first battery from the electronic device, and
• wherein separating the first battery from the electronic device comprises separating the first battery from the first slot in the first direction by rotating a lever disposed on the electronic device in respect to a second direction substantially perpendicular to the first direction.

An electronic device comprising:

• a housing;
• a battery mounting portion formed in the housing to have a battery disposed therein, the battery mounting portion including a first slot to have a first battery disposed therein and a second slot to have a second battery disposed therein;
• a separation device disposed in the battery mounting portion to separate the first battery from the first slot or to separate the second battery from the second slot;
• a charging circuit configured to charge the first battery disposed in the first slot or the second battery disposed in the second slot by using an external power source;
• a processor electrically connected with the separation device and the charging circuit;
• and
• a memory operatively connected with the processor,
• wherein the memory is configured to store instructions that, when being executed, cause the processor to control the separation device to separate the second battery from the second slot when the first battery is disposed in the first slot, and to separate the first battery from the first slot when the second battery is disposed in the second slot, and
• wherein the separation device comprises a motor, and a lever connected with the motor, the lever comprising a first extension portion extended from a portion connected with the motor toward the first slot, and a second extension portion extended toward the second slot.