A battery receptacle includes an insulative casing, positive and negative electrodes, and an interface assembly. The positive and negative electrodes have end portions disposed on the casing. The negative electrode has an end portion disposed on the casing. The interface assembly is disposed on the casing, and includes an insulative body, anode and cathode terminals, a contact element, and an insulating protrusion. The anode terminal projects from the insulative body, and is in electrical contact with the end portion of the positive electrode. The cathode terminal is provided on a periphery of the insulative body. The contact element is in electrical contact with the cathode terminal, projects from the insulative body, and is in electrical contact with the end portion of the negative electrode. The insulating protrusion is provided on the insulative body, and abuts against the end portion of the positive electrode.