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There are a few reasons cars may have more then one battery. Cars with big stereos sometimes run a second battery along with large capacitors to be able to supply the stereo with power.
4WD's sometimes have a second battery if they are running a 24 Volt system.
Or maybe a second battery may be used in a campervan for example to power devices like lights and tosters without draining the main battery ensuring you can start the engine.
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∙ 16y ago
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