9% loss? If true, that could be concerning, unless the first loss is by far the worst loss.Well the TLR is that he concluded his ID3 lost 9% of its battery capacity in 1 year.
Admittedly he rapid charged a ridiculous amount including to 100% regularly.
Saying that, it if is attributed to lots of rapid charging, I'd estimate that my car will probably be subjected yo less than 10 rapid charges per year. So far the Family has had 3 rapid charges to 90%+, all middle of a big journey with immediate use/depletion through continuation of the journey.