Here’s Apple’s explanation of what you can expect if you enable this setting:
If you select 80% Limit, your iPhone will charge to about 80% and then stop charging. When the battery charge level drops to 75%, charging will resume until the battery charge level reaches approximately 80% again.
As I was testing the settings on my review device, I noticed that the phone was charging above 80 percent anyway. Apple says you can expect this to happen from time to time.
When you enable the 80% limit, your iPhone may charge to 100% to maintain an accurate battery charge estimate.
This new option joins the existing Optimized Battery Charging settings that have been available on Apple devices for several years. Based on your usage patterns, this setting will keep your battery charge at 80% and then fully charge before determining that you need to use your phone. Apple also just released iOS 17.0.2 for the iPhone 15 series, and I’m currently installing it to see if my charge will actually start hovering around 80 percent if I enable the new settings. doing.