To enhance your battery’s long-term capacity, I would not charge past 80% on a regular basis unless you need the extra range. If you charge to 100% on a regular basis, your battery capacity will diminish much like a cell phone. It may say 100%, but it may not be able to charge to it’s original, full capacity. That warning is there for a reason.
You’re probably going to get other people on here saying that they charge 100% and haven’t seen any degradation, but you will see it after several years. Note the iX has only been out for about 2 years, so no one has probably noticed yet. If you buy a new car every couple of years, then it’s probably not something you need to worry about.
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