@anthropy

TÜV (Technischer Überwachungsverein) was founded to rise security in steam powered machines (!!).
If you change something on motorized vehicles which is relevant for driving or security (like electronic (gps) or battery, better brakes, etc.) you have to let them inspect. The original model of manufacturer has an EC type-approval.

If TÜV (or other engineers, TÜV is only one of a handfull accredited /allowed organisations) does not agree, they will decide you must not use the vehicle in public.

On the one hand, many things are good! On the other hand, what the fuck has a greater capacity battery to do with driving security? 😅