Normal,I charged my iPhone overnight to 80% since I bought.Then,it only over to 81% at one time.Yesterday night,I charged it as usual but it charged to 100% .So, I check again optimized settings is on or not.It is still on.I normally unplugged around 1:00 am or sometime 3am.What happened???? It is first time charged until 100%.
iPhone 16 Pro Max, iOS 18
Perfectly normal and how Apple designed it to work. With the Charge Limit set, your phone is supposed to charge to 100% occasionally. Read this --> About Charge Limit and Optimized Battery Charging on iPhone - Apple Support
With a Charge Limit enabled, your iPhone will still occasionally charge to 100%. This is to calibrate the battery health gauge. There is no clear definition of “occasionally” and it all depends on smart algorithms such as usage, conditions, etc and is different per person. Some have seen it charge to 100% weekly, others monthly, some in between. I see my iPhone charge to 100% around twice a month.
Charging overnight iPhone 16 pro max
