An electronic device is provided. The electronic device includes a battery, a connector including one or more signal terminals, a power regulator for adjusting a first voltage from the battery to a second voltage, at least one processor operably connected to the one or more signal terminals and the power regulator, and a memory. The memory can store instructions, that during the execution thereof, allow the at least one processor to sense the connection to an external electronic device through the connector, acquire identification information about the external electronic device after outputting the second voltage through the connector onto the external electronic device connected through the connector, and output, on the basis of the identification information of the external electronic device, the first voltage onto the external electronic device through the connector by using a bypass route.