My battery life on my iPhone 7 and iOS 10 was decent. With iPhone 8 and iOS 11 it’s terrible. 20 percent by 2pm from 100 percent at 8am. The Genius said the battery tested fine and it was something in the settings. Reset all settings. Battery today is same old crap. Very disappointed. I’m buying a mophie battery case because I don’t like this situation with this drain. Are others seeing a big drain with iPhone 8 vs their iPhone 7?