An electronic device includes a main body, a control switch, and a sliding block. The main body defines a cavity for receiving a battery. The main body includes a sidewall defining an opening communicating with the cavity. The sidewall further defines a through hole adjacent to the opening. The control switch is engaged in the through hole and rotatable with respect to the sidewall. The control switch includes a protruding portion. The sliding block is movable in the main body. The protruding portion presses against the sliding block and pushes a part of the sliding block into the cavity to block the battery therein when the control switch is rotated to a first position.