I have an XR and as I am indoors a lot of the time, my phone does spend a few hours charging at 100% (although I unplug at night). It's rare that I let the phone run past 80% and even rare that it goes past 60%.
Is this likely to damage the battery?
This Macworld article says
isn't optimal, although it won't necessarily damage your battery. However, I've seen other people stating that charging to 100% is very damaging which is why Ios 13 will have measures to prevent it. Further still, I've seen articles state that iOS 12 already is designed to cope with charging at 100%, and the iOS 13 improvements are more to do with overnight charging.
What's the correct answer? Also, as should I shut down the phone at night if it is not charging?