https://techcrunch.com/2018/07/10/some-ios-users-report-that-11-4-update-triggers-excessive-battery-drain/

iOS users have been reporting problems with excessive battery drain after updating to iOS 11.4.

On Sunday, 9to5Mac reported on a raft of posts on Apple forums complaining about excessive battery drain since updating. ZDNet also flagged complaints around the issue early last month.