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A battery disconnect switch, also known as a battery disconnect switch or cut-off switch, is a device used in vehicle and boat electrical systems to completely break the connection between the battery and the vehicle's electrical circuits. This switch is often used as a safety measure to prevent parasitic discharges from the battery when the vehicle is inactive for long periods, to prevent theft, or to allow safe maintenance of the electrical system. Typically, the battery disconnect switch is a rotary switch or a switch that can be manually operated to open or close the battery's electrical circuit. Its main function is to cut off the battery's power supply to avoid unnecessary consumption and potential electrical hazards. Hello! My name is Luis and I have been a Marine Mechanic for 28 years, owner of LC NÁUTICA Oficina, I work with outboard, inboard and sterndrive engines. We are also specialists in marine electricals.