My personal experience: I never turned off Bluetooth or WiFi or 4G. With iOS 10, before going to sleep I'd put my iPhone 7 in Energy Saving mode and it's batter

My personal experience: I never turned off Bluetooth or WiFi or 4G. With iOS 10, before going to sleep I'd put my iPhone 7 in Energy Saving mode and it's battery would go from 100% to 99-98%, now with iOS 11 it's going from 100% to ~90%. So I'm guessing the battery draining is coming from other places.