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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.
As a developer who has written drivers for DSP and other low level stuff, I can say with great certainty that this is definitely an iOS bug. The problem did not occur at all before the 11.4.0 update. As soon as that update dropped it happens without fail for the past 5 weeks. It's not background apps. I can close all apps, charge to 100%, unplug when I go to bed and in the morning it's 20%. Something is getting stuck in a loop or maybe some chip is getting bad commands. The phone gets physically warm so something is running free.
No doubt everyone that always used their iPhone a lot is going to jump in an say "me too" when their problem is that they're just using their phone a lot. So naturally that has created enough doubt to muddy the diagnosis. And Apple has not acknowledge the bug so there are a lot of responses regarding how to turn things off to improve battery. But, again, that is NOT the problem. The problem is something is running uncontrolled.
There are many theories as to the cause. Many have to do with something related to WiFi. The only pattern that I have seen is that if I shutdown and restart, the problem goes away for a while. But as soon as I use the phone for whatever reason, it comes back. It might take 6 hours. It might take a day. But eventually it always comes back and then it's stuck draining battery unless I reboot.
Note that iOS 11.4.1 was just released yesterday. But the release notes say nothing about battery anything so it remains to be seen if they have fixed it. It is discouraging that they have not acknowledged it. It makes you wonder if they're actually having trouble reproducing it. But that would almost unbelievable since they could just install 11.3 and compare. Of course we can't do that because 11.3 isn't signed anymore so it cannot be installed. Obviously it's not a trivial CPU loop or they would have spotted it quick. Running the CPU in debugging mode probably suppresses it or again they would have spotted it quick.
I'm starting to have doubts about Apple. Steve Jobs was a prick but maybe that's precisely why he was so successful.