iOS 11.4 battery drain

iPhone 6s iOS 11.4 (battery replaced, health 95%)

Tried all the above options to solve the problem for the time being, but NO FUN…

But then I noticed the battery life was great when I was working and out of range of my home WIFI.

So I started testing:

WIFI ON and iPhone locked -20% per our.

WIFI ON and iPhone regular used -40% per our.

WIFI OFF and iPhone locked -2% per our.

WIFI OFF and iPhone used 4G -12% per our.

In all situations above Bluetooth and Personal Hotspot are ON.

Considering that all Apps show up in Battery Usage (even when used in the background), it must be the WIFI itself.

Tried some different WIFI settings and resetting the network, but only shutting down the WIFI completely helps.

So now I’m on 4G until Apple repairs this… APPLE ..!!

Hopefully this is a temporary solution for some of you too.

I posted a reply on a different thread, but for me It appears to have been a network issue since I was having different behavior on different wifi networks both on and off (iPhone 6s and iPad Air2... no issues on iPhone X).

After the usual Restart, Hard Restart, disabling most of the location settings, what ended up solving it for me was resetting my network settings under Settings > General > Reset > Reset Network Settings.

Today I was able to experiment with the suggestion that the wi-fi connection to the 5ghz band was causing the issue. I have a dual band home wi-fi router. My priority connection list had the 5g band as my top choice.

Battery drain on my iPhone 6s was about 12% an hour with ~ 10 apps open in the background and the phone in standby (locked - screen off). I changed my connection priority so that my iPhone would connect to the 2.4g band instead. I had the same apps open in the background, phone again in standby. Battery drain was 1-2% an hour.

Interesting is, that I was switch OFF WIFI.

But after some hours it is SWITCHED ON.

So I was SWITCH OFF it again, yesterday evening, before plug in charge.

Today morning WIFI was again ON.

I do not understand why WIFI is SWITCH ON automatically.

iPhone SE : 2 years old
Battery Health : 85%

Battery Performance Management : Applied
Wifi : Off

Location Services : Off

Background App Refresh : Off

Low Power Mode : On

Auto iCloud Backup : Off

Analytics (iPhone & iCloud) : Off

App Store Auto-Update : Off

App Store Video Auto-Play : Off

Siri : Off

Besides all these battery saving tips, my iPhone SE battery drains too fast. 35% loss overnight and it got turned off (Around 35% approx at 3 AM and the phone got switched off when I saw at 10AM)

All after iOS 11.4 update!

Immediate fix required. It's literally irritating, investing huge money for such unstable OS

This is a known behavior of iOS. Apple unfortunately decided a while ago that turning off doesn't mean off in some cases - it's more like a "temporarly off". This happens, if you turn it off from the control center. If you really want to turn it off, you have to do it from the preferences and it should stay turned off.

Apple more often makes weird design decisions. The control center behavior is one of the most annoying ones from my point of view - anyway... Try it through the preferences...

me too

after the update battery down to 2% just after few hours ...can’t use the phone I have to I plugged in all the time bad very bad they fix one thing and break another I wonder who is in charge of this

I posted this earlier above and seems to work for many (myself included). Seems to be a network issue. what solved the issue for me on my devices was resetting my network settings under Settings > General > Reset > Reset Network Settings. then re-add your connections.

Yet another "same issue for me" reply. Both mine and my wife's 6s noticed huge battery drain after updating to 11.4. While I understand things can "take awhile to settle" after an update, I shouldn't have to scour the internet for a bunch of hacky fixes to a well established os. The settings I run on my phone have worked perfectly for the past 2 yrs, I see no need to have to adjust them just to address a battery drain issue that is clearly os related.

Here's to hopes that Apple will find and address our issue in 11.4+. Needless to say both phones had to be rolled back to 11.3.1, as the amount of drain seen rendered the phones relatively useless, unless we wanted to carry chargers around all day.

Same issue. I have a two year old SE which already has response issues; battery drain was immediate. Read all the tips to turn off this and that...and I have very little “on” - why should I have to stop using the device as it was meant to be used? Why have features you can’t use because they cause major batter drain? Please fix this.

It does worry me that despite Apples assertion at the that they are focusing on quality in iOS this still happens. Now I am a developer so I understand how difficult it is to test everything and catch every bug but this is the same battery drain problem that pops up every time Apples does a major release. In fact now it's happening not just on major releases like 9,10 or 11 but on 9.X, 10.X and 11.X. Apple roll out a .X release and it is almost guaranteed to have battery issues. Then those problems are diagnosed and fixed in .X.1 or .X.2 release. BUT roll around .X+1 and the bugs are back.

Apple are also in a rather special position, they control the hardware and the software which makes testing way easier and cheaper for them. They can and probably do have test labs where they can easily have a version of every iPhone supported by a new iOS version, including every chipset or screen manufacturer and still have them all fit on one desk. They can test the hardware for things like "Wifi at 2.4GHz and 5.0GHz" and see how the phones perform and measure the battery drain. These problems have occurred before they have tested and diagnosed them before so they could and should be in the regular test cycle for a release of iOS.

We have gotten to a point where I expect battery problems in the .X release so I wonder if Apple simply loads the .X releases with debug code intended to test and diagnose problems then removes that code in the .X.1 release. In reality the .X is the final mass Beta version and the .X.1 is the goldmaster. They just dont tell us because no one would update to the .X version if they knew they would have a couple of weeks of drastically reduced battery life.

Right I had this same issue yesterday. Leaving my house, my phone was on 95% and when I came back a few hours later it had dropped down to 50% with no phone use at all during those few hours. I think this had something to do with the recent 11.4 software update that I made on my phone a few days ago. Is there a way we can downgrade to the previous software update because I do not want my battery percentage dropping dramatically like that with minimal to no phone use at all. If anyone can think of any suggestions or resolutions on how to preserve battery percentage please let me know, thanks!

After fussing around with wifi settings etc, I finally downgraded to IOS 11.3.1. The severe battery drain issue completely disappeared and life was good again. My question is, why is Apple silent on this issue?

Even im facing battery drain issues. my battery drained from 40%-9% in 15min,the strange part is when i restart my phone when it is 10% the battery surprisingly showing 18%.please APPLE fix it ASAP,By the way I'm using 6s+

Hey Lawrence, with all due respect again, this is definitely an OS issue, and a big one. I have the problem too and it´s clear as day. I don´t care if it always happens, or if it affects just few people. It shouldn´t. Batteries don´t go bad like this overnight. It´s the first time my phone went from 84% to 74% in a meter of seconds. Stop assuming people are dumb/lazy. An iphone costs a fortune, and we shouldn´t have to lose hours trying to figure out how to solve an OS bug. Apple must solve this, period.