How to enable battery level Audi MMI 3G (A1 A4 A5 A6 A7 A8 Q3 Q5 Q7) 

Activate battery level gauge on your MMI 3G screen in Audi cars (A1, A4, A5, A6, A7, A8, Q3, Q5, Q7). Check your battery voltage condition to avoid power loss and engine start issues.
You don't need any diagnostic tools like VCDS to do this. Everything can be done just with hidden green menu.
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