As the name suggests a dual battery system is a second battery for your vehicle, and it is also known as an auxiliary battery system. A dual battery system is separate from your starting battery in your car.
Generally the first time people realise they need a dual battery system is when they want to run a 12 volt portable camping fridge. A dual battery can also be used to power a range of 12 volt accessories – air compressor, lights, kettle etc. It can also be used to charge devices like mobile phones, iPads, tablets, cameras, GoPros. Basically, if you can charge it via USB – your dual battery system can keep it powered up.
