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Is iOS 11.4 Draining Your iPhone's Battery? You're Not Alone (zdnet.com)
If you've noticed that the battery life on your iPhone is not what it used to be, it's likely that the problem isn't with your iPhone or some setting or app, but a bug in iOS 11.4. From a report: Apple's support forum has been blowing up with complaints from users that battery life has been seriously curtailed since installing iOS 11.4. The problems seems to be reasonably widespread and affects the iPhone line up across the board. I've seen this issue on the iPhones that I use. It seems to be accompanied by the device running unusually hot.
From what I recall reading on Slashdot, this issue is raised nearly every time there's an upgrade to iOS and the reason is that while the basic upgrade happens right away to ensure usability as quickly as possible, there's a ton of stuff that happens in the background for some time to come. It's the background activity that appears to shorten the battery usability. Once the background activity is done, back to normal, more-or-less.
Or so I've read. Personally, I don't own an Apple device of any sort so I can neither confirm nor dispute. Don't blame the messenger.
Put my fist through my alarm clock with its ding-dong death inside my ear. - The Blackjacks.
Based on my own experience, iPhones are not born equal. Anyway I'd check the "background app refresh" settings and unset most of them...
Slashdot, fix the reply notifications... You won't get away with it...
Based on my own experience, iPhones are not born equal. Anyway I'd check the "background app refresh" settings and unset most of them...
I started doing this years ago, and have never had any battery issues. 95% of the apps on my phone should be doing nothing if I am not using them.
- Vincit qui patitur.