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What is the purpose of the auxiliary battery in an Audi A2?

I recently noticed the auxiliary battery in my Audi A2 and I am curious about its function. Can someone explain its purpose and how it differs from the main battery?

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Answers (3)

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The auxiliary battery in an Audi A2 serves as a backup power source for essential electronics in case the main battery fails. It also helps with start-stop systems and reducing load on the main battery.

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While the main battery powers the engine and other major components, the auxiliary battery is responsible for supplying power to smaller systems such as the cabin lights and infotainment system.

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The auxiliary battery may also assist with regenerative braking, storing the energy generated during braking and using it to power the electrical systems of the car.

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