I put together a DIY video for replacing the 12V battery in a C8 A6 Allroad since I couldn't find a guide when I was doing the job, and figured I'd share on the forum.
The short version: it's a royal pain.
It's a long video but should help people through the process if they want to tackle the job.
https://youtu.be/Kg7oenvf_Gg
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