Caporegime
There isn't really any battery service or testing needed I don't think. You might get some software updates by going to the dealer but I don't think there's anything major for the etron.I'm about to jump into the BEV world (Audi e-tron).
What are current owners doing for servicing? I've owned VAG cars for years and have a very reliable local indy garage near me but they can't service or test the battery at the moment. Anything mechanical they're happy to fix.
Be prepared for awful efficiency compared to all the figures others are posting though, you're looking at just over 2miles/KWh in winter.
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