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The two batteries are wired in parallel (positive to positive and negative to negative) through a relay. Very basic dual battery set up shown above. If needed, the auxiliary battery can be used to jump start the starter battery. The other battery (called the house or auxiliary battery) is dedicated to powering all your accessories when the engine is off. In a dual battery system, one battery (referred to the starter battery) is dedicated to starting the car. One way to prevent this is by adding a second battery to power your accessories and make sure your starter battery is topped off when it's time to go home. This could leave you off the grid longer than you had planned. If you’re parked at camp, running your fridge and camp lights in a stationary car with the engine off is a quick way to discharge your battery. When your car is running, the alternator keeps the battery charged. Whether you’re camping just outside of the city or trekking across the continent for weeks at a time, a dead battery can ruin any trip. The last thing you want to happen when you’re off the grid is a dead battery Why would I need two batteries? On top of your accessories, you also rely on the battery to start the engine. Whether you’re running a winch, air compressors, fridge, lights or even adding USB outlets, your electrical system can only handle so much. By now, you should know that leaving your lights on when the engine is off can drain your car battery pretty quickly. If you’ve been driving for a few years, you’re likely to have experienced a dead battery at least once.