Battery drain after ios 9.3.3 update
What can I do to lessen the battery drain on my iPhone 6 after the iOS 9.3.3 update?
What can I do to lessen the battery drain on my iPhone 6 after the iOS 9.3.3 update?
Try the steps in this Apple article.
http://www.apple.com/batteries/maximizing-performance/
In particular try turning Background App Refresh to OFF.
Battery drain after ios 9.3.3 update