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What is the purpose of the Audi A2's secondary battery?

I noticed that the Audi A2 has a secondary battery in addition to its main one. What is the main function of this secondary battery and how does it contribute to the overall performance of the vehicle?

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The secondary battery in the Audi A2 serves as a backup power source for important vehicle systems such as the engine control unit. In the event of a main battery failure, the secondary battery ensures that critical systems can still function properly.

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Not only does the secondary battery act as an emergency power source, but it also helps to balance the electrical load in the vehicle by providing additional power during high-demand situations. This helps to improve the overall efficiency and performance of the Audi A2.

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