AGM Deep Cycle Batteries 101: The Present and Future of Auxiliar Power
The batteries in cars are all the same, at least the ones that power engine bay components. While most power the electrics inside the car, some can be used only to provide short bursts of power which excludes any cabin-related controls. This is the reason why deep cycle batteries exist. A deep cycle battery is able to provide a low current for a long period of time which is what your car's heating, infotainment, lights and other comforts require to run properly. But since most cars come with a single battery, caravans are the ones that make use of deep cycle batteries since a single one can power everything.