A wearable electronic device is provided that includes a housing, a battery disposed in the housing, and a coupling member, connected to the housing, for detachably coupling the electronic device to a part of a user's body. The wearable electronic device also includes a conductive member exposed on a side of the housing or on a side of the coupling member and electrically connected to the battery. The conductive member includes one or more contacts. The wearable electronic device further includes at least one sensor electrically connected to the conductive member, and a circuit electrically connected to the battery, the conductive member, and the at least one sensor. The circuit monitors a voltage and an amount of current received via the one or more contacts, and charges the battery with the current or operates the at least one sensor, based on at least one of the voltage and the amount of current.
