iOS 11.4 battery drain

Ive got exactly trhe same problem since 11.4 update. My phone has been on 100% all day long today even though I have constantly used it !! Yesterday at 38% it just cut off. I plugged it in and it said 1% battery then it jumped to 25%. My wifes phone has done exactly the same thing since update too !! This is not just coincidence. Please sort it APPLE !!

This is definitely root of problem.

I was try reconnect my iPhone from WIFI 5G to WIFI 2,4G and it solved my problem.

I hope, that this will help apple resolve this bug.

I feel not like user of apple, but beta tester. I hope next time they will check release better.

Dave_OC wrote:

With all due respect Lawrence, it is clearly a problem with IOS 11.4.

I have seen that statement after every iOS update since 1.1 in 2007. The only thing that changes is the version number in the statement. So clearly, every version of iOS has had this problem since the beginning of iPhone time. Alternatively, it is something unique about the phones that have it, or it is something that failed in the process of updating. Your choice. There are around a half billion phones that have been updated to 11.4. If even a vanishingly small number of them have this problem there would be thousands of posts about it. Once it really was a problem, 6 years ago. There were 13,000 posts about it, at a time when there were only 100 million phones, and the problem affected only 5% of those phones. Today there are over 1 billion phones, and it is estimated that around half of them updated. If that same problem occurred today there would easily be over 100,000 posts. I see 90 in this thread, and a lot of those are repeat posts from the same users.

Here is a way to tell. Back up your phone. Restore iOS using iTunes and set up the phone as New. Do not log in to iCloud. Do not add any email addresses. Do not turn on iMessage or FaceTime. Do not add any apps. Check your battery usage for a day or two.

FWIW, neither of my iOS devices have exhibited any change in battery life.

Marcos Duran wrote:

This is first beta release of a new OS version. If you are surprised with things going wrong you have no business installing this. The point of a beta is either development or helping to report bugs not ***** about them here. Download the Feedback app and submit feedback or go back to the release version.

No, it is not the first beta of 11.4, which went GA 2 weeks ago.

I have the same issue on iPhone 7. Battery life lasting around 12 hours. It went from 50% to 20% after one short phone call. Highest using app consumed 18% of battery in previous 24 hours. Spoke with Apple suppor, they did remote diagnostics and everything checked out ok.

Not having the issue with my iPad.

seriously disappointed

I have the same issue on my 6S (64Gt), but my wife’s same age 6S (16gt) is working as usual. I notised that when i turned off mobildata on my phone that the battery usage is normal? I hope that Apple give us a fast solution on this case😠

After having the battery drain issue as so many others here with iOS 11.4, I've reseted my network settings (Settings>General>Reset>Reset Network Settings). That brought my iPhone X back to normal battery consumption, independently of beeing connected to 2.4 or 5 GHz WiFi. Maybe this is a way to solve the problem at least for the iPhone X.

Beyond that I've noticed, that my company iPhone 6 and my iPad Pro 10.5'' are both not effected from that bug.

However, I hope there will be ab bug fix soon for all of you where that solutions doesn't help.

I can confirm findings posted above as well and would like to share my observations.

From a first look the issues seems to be related to a service(s) or daemon(s) that got "stuck" when using 5G wifi network or most likely when network is reset.

I've tested with 4 different routers consumer grade netgears (R7000,R9000) , AT&T uverse, and enterprise grade HP Aruba with 3 Apple devices iPhone 6, 6s and 5th gen iPad and results are with respect to power consumption are consistent it goes up when using 5g wifi network. The impact varies between devices .. from ~2x times for iPad to ~20x times for iphone6, but doesn't depend on router I'm using.

Iphone 6s was reset to factory defaults to have a reference point and make sure it's not due some app that I have.

All devices were fully charged and rebooted before each test. Each test was 12h or until battery drops below 80% whatever comes first all background services/activities were disabled.

When device is connected to 5G network, I see that after some time (typically 10-60 mins) device drops from network and reconnects. This never happens with 2.4G networks. Until connection is dropped for the first time the power consumption seems to be the same for 2.4 and 5G networks in averaged ~0.5% per hour for iPhones (~0.1% iPad)

After first network drop on 5G wifi power consumption goes up. Worst was iphone6 which in average consumes ~10% per hour while idling (screen off)

Once 5g-network-drop happens, switching between networks (I.E going to 2.4G), turning on/of Wifi or Airplane mode, doesn't help, but reset does help.

On iPhone 6 after initial "drop", some services become unavailable, for example phone can no longer see Airplay enabled Yamaha received, or stream audio over BT to my Car (in the same time calls over BT works fine). This never happens if all 5G networks are disabled and phone is allowed to connect to 2.4G networks only.

In my personal opinion there's some issue with network services and/or driver which cause a network to be reset. Depending on device it may or may not fully recover, older (slower) devices are more prone to the issue and often not all servers are properly function after network is reconnected so most likely there's some race condition in one of the services as well. This can also explain why different app can start to consume too much battery. Whatever app was last to access service that stuck, goes to the top of battery consumption chart.

After running tests I downloaded logs but I don't see any (new) crashes.

nsurlsessiond process shows a bit high cpuTime, but I have no knowledge about iOS so don't know if it's the one to blame or just another victim.

I've submitted ticket to Apple they run all diagnostics/collected logs as well, but so far found no smoking gun. They promised to send it to engineering, will see how it goes.

Hope that helps.

I made the following changes

• turned off WiFi
• turned off Bluetooth
• went through "Settings > Notifications" and turned off Notifications form any App that I did not need it from.

Battery usage has gone back to "almost" iOS11.3 level.

Idle time battery is the same as iOS 11.3.

Active time still drains extremely fast. I, too, can watch the battery usage do down as I use any interactive application.

hi all pl see the photos i hv uploaded my iphone SE FROM 9.30 pm to 6.30 Am in standby mode . the battery drained from 99 percent to 75 percent!!!! the other 2 photos from my iphone 5 with a GradeA generic battery in standby mode for the same timings . it drained from 62% to only 59%!!!! Sleeping ios 11.4. engineers will they ever wake up .

I have major battery drain on both my iPhone and now Ipad Pro after upgrade. Phone battery drains within 2 hours down to 0% making it impossible to use when on the move and away from power. IPad Pro now also drains to 0% overnight - was running fine prior to 11.4. Both devices have Locations services, wifi and all the main players off overnight. I’ve Been an Apple supporter since the early 90’s. Need to upgrade two phones and now for the first time am extremely hesitant to get anything Apple - over priced devices requiring a constant power supply.

This is one long discussion, took me some time to read through but with everything tried a couple of things stand out, a solution for one doesn’t seem to work for others and no one seems to have tried an iTunes Restore as New or if they have they haven’t reported back!

In my opinion if the issue was just iOS related then every specific iDevice would have the problem, ie if one iPhone X is effected then all will be, but my X has been fine. That would tend to indicate the problem has come about from either the Update process conflicting with what’s already on the users device (data, caches etc) or how the Update has actually been applied (OTA or iTunes).

To rule out both of the above can someone do the Restore as New to see what happens, I appreciate it’s a big ask but with iCloud most of your data and photo’s will come back once signed in again with your Apple ID (if things have been setup that way in advance). If a current iTunes BackUp is also archived everything can be returned to “normal” in the event the Restore doesn’t resolve.

The above is just my view on this situation but on page 5 someone did report being given an exchange unit by Apple and even though that was still on 11.4 all was ok, I’m assuming because the new device was devoid of any junk, and even when adding the Apple ID I guess every continued to operate as expected.

As I said, just my view, but might be worth a try.

That’s not what I would have expected, this issues defies all logic, if there are devices running ok with 11.4 you would think those that have been unlucky enough to have the issue should be ok with a clean install.

It’s almost as though there as different releases of 11.4 floating around, unless as someone earlier in the discussion was trying to work out, is there a conflict with certain hardware in those unlucky devices!

Apple sort this out! iOS 11.4 My battery is stone dead in the morning after fully charging at night. No apps open, airline mode on. Am getting 2 hours usage from full charge max and that is with mail push off, no video, no music & no calls. This is the worst experience of an Apple product ever!

i used 4g a lot yesterday to watch Sky Sports on my Iphone and playing games. Battery consumption was way less than using it on Wi-Fi. I used Safari last week on Wi-Fi and could see my battery drain in just a few minutes. Did the same again on 4G and hardly any batter drain. May be different on other peoples phones - but my experience is that Wi-Fi is causing this issue on my phone.🙂