iOS 13 supposedly cuts off charging at 80% when charged overnight and resumes before our perceived wakeup time to give us 100% charge - https://www.howtogeek.com/423451/how-ios-13-will-protect-your-iphones-battery-by-charging-to-80/ . Although this is better than earlier methods, this still isn't as optimal the smart power strip which gets realtime battery stats and charging plan from the smartphone.