Just updated to iOS 11. Had 100% battery life. Updated to iOS 11. Battery at 85% - figured it would happen because that's what happens when tech has an update - it relies on battery. Not even 5 minutes into using the phone, percentage is down to 65%. The lag on the iPhone 7 is terrible. Hell, I will likely now try to see how to get an iPhone 8 just so the battery drain isn't so bad. The iOS 11 update on the iPad Pro (9.7) is awesome. It's like a whole new experience.