Is that the default behavior on iOS? I'm not familiar with the details, but I thought there was logic for optimizing charging, IIRC so that it charges quickly to 80% but then slowly to 100%. And once it hits 100%, it's not like it's constantly drawing power to maintain that level.
You are correct, that's "optimized charging" setting, and it is on by default (but if one is inclined to turn it off for some reason, they can do it in settings).
