A battery disconnect switch is a safety device that allows you to quickly and easily disconnect the battery from the rest of the electrical system in your vehicle. This can be useful in a variety of situations, such as when you are working on the electrical system, or if the vehicle is involved in an accident.
Battery disconnect switches are relatively inexpensive and easy to install, and they can provide a valuable level of protection for your vehicle and yourself. If you are not comfortable installing the switch yourself, you can have it done by a qualified mechanic.