watchOS 7 can tell you that and a lot more.
Potentially one of the best feature to hit the iPhone in the past few years was Optimized Battery Charging. First introduced a year ago with iOS 13, Optimized Battery Charging was designed to reduce battery wear, and therefore increase its lifespan, by limiting how long your iPhone remained fully charged by pausing the charging process at 80 percent, and then using on-device machine learning to learn your daily charging routine to determine when to add the past 20 percent of charge so your iPhone is ready for you when you wake up. Apple then went on to add the same to macOS Catalina 10.15.5. And based on testing I’ve carried out, this feature does indeed reduce battery wear, and the machine learning is quick to pick up on your habits and make this feature something that works in the background and which doesn’t inconvenience you when your schedules change.
