A battery disconnect switch or battery cutoff switch can protect your car from theft, or keep a grounding issue from draining your battery. Disconnecting the battery when a vehicle isn't in use can prevent your battery from draining while it sits idle for weeks or months. A battery disconnect switch makes this easy by allowing you to disconnect the battery without any tools. Simply flip the battery disconnect switch and the flow of current from your battery will be shut off. A battery disconnect switch is also a great tool for cars that you only take out on special occasions. This allows you to power down the electrical system so your car is ready to go the next time you are. O'Reilly Auto Parts sells problem solving components, like battery disconnect switches, to make your repairs easy.