Yes, the battery needs coding to tell the car about its capacity, battery type, etc. to optimize the charging. Fortunately coding modules is not completely locked behind dealer-only tools (see VCDS https://www.ross-tech.com/vag-com/VCDS.php), but it is very inconvenient for the non-enthusiast who probably doesn't want to spend $200 on a tool to code their battery.
hn_acc1|1 year ago
Why can other cars get away without this specific charging knowledge? Is it because , in true VW fashion, they specced the minimally-acceptable battery size and need to have optimized charging to mitigate the under-sized battery? Just like VW has under-specced wiring for decades.. Seems pretty suspect..