iOS 11.4 could ruin your battery life

“My iPhone 6 was working perfectly fine until I updated to iOS 11.4 and ever since I did that my battery is draining rapidly even without me using it at all,” reports one user on the Apple support forum. “I used to go a full day without charging it now it may last half a day.”
“I’m very strict when comes to services enabled on my iPhone 6s so the battery usually lasts for over 24h if I don’t use Maps,” writes another. “After the upgrade to 11.4 I have 2% of my battery after 11 hours. It now lasts less than half of the original time it did before the upgrade.”
It seems no iPhone is immune to this issue; users are reporting similar experiences on the iPhone 7 and iPhone 7 Plus, the iPhone 8 and iPhone 8 Plus, and even the iPhone X.