The battery can be disconnected for normal replacement or servicing of the vehicle by a mechanic. Follow all appropriate procedures. Special precautions should also be taken in order not to arc the cables at the battery terminals. Since the ignition interlock monitors certain vehicle aspects even when off, the battery should not be disconnected more than necessary. Please consult with a Monitech service operator or your local technician prior to extended disconnect or for any questions regarding battery change or charging.