4x4 vehicles often have a lot of electrical accessories fitted, such as winches, lights, and fridges. This means that there is a greater demand for power and that the battery needs to be able to provide this power for extended periods. A dual battery system ensures that you have a backup power source in case one battery fails and that you can charge both batteries at the same time. This means that you can keep your vehicle running even if one battery dies and that you'll always have plenty of power on hand for all of your electrical accessories.