An electrical apparatus system includes a tool battery used as a power source for an electrical tool, and an electrical apparatus having a battery-connecting portion configured to allow the tool battery to be electrically and mechanically connected thereto or disconnected therefrom. In a state in which the tool battery is electrically and mechanically connected to the battery-connecting portion of the electrical apparatus, the tool battery is exposed on a lower side of the electrical apparatus so as to support the electrical apparatus on an installation surface thereof as a base.