I've been searching the forum and most of the posts about this are old and involve older versions of iOS. I just got a 15 and set the battery charging option to the 80% limit setting. The last two nights it went to 100%. I understand occasionally it will do this for calibration purposes, but seems odd that it just keeps charging to 100%. And two times earlier this week I took the phone off the charger before it got to 100%, but it was still over 80% (like 83 and 85 when I noticed). I am on the latest version of iOS. Is this still an issue for some people? If so, is there a fix? I will see what happens tonight, but it just doesn't seem to be working as intended.