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Question:

Question: iOS 11.4 battery drain

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. I used to go a full day without charging it now it may last half a day. I am just wondering if something got turned on with this new update that I have to turn off to save battery life. It is just weird I have not done anything other than update the iOS and now this happening. Any help would be greatly appreciated.

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Jun 5, 2018 3:10 AM in response to Zide99 In response to Zide99

I need to post another answer. The battery performance is even worse than I initially suspected. Now after 3 hours of doing nothing in the morning (3 calls, 2 messages, no music, no Maps) it dropped from 100% to 20%.

My battery health is very decent, i.e. 89% so the problem is definitely related to iOS upgrade.


Apple, please fix it!

Jun 5, 2018 3:10 AM

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Jun 5, 2018 8:29 AM in response to Zide99 In response to Zide99

I am having the exact same problem on my iPhone 6S. Last 3 nights in a row, I went to sleep with iphone at 70-80% charged and by morning (in 7-8 hours) my phone was dead, down to 0% battery. I did contact Apple support, they ran diagnostics and said all looks good. My battery health is at 100%, I have recently upgraded the battery.

This started exactly after the iOS upgrade to 11.4, it's already been 4-5 days and issue still continues. Keeping location services off can't be a solution to this.

Jun 5, 2018 8:29 AM

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Jun 5, 2018 12:03 PM in response to Zide99 In response to Zide99

I have/had this problem too. I tried all possible solutions to this issue but to no avail. Then I figured I’d try something else and that was to reinstall iOS from the 11.4 IPSW file with iTunes.


As of now I have done this for one of our iPhone’s that has the drainage problem. So far battery seems back to normal approx 5% per hour w/ moderate use.


Search DuckDuckGo: iOS 11.4 IPSW.

OSXDAILY has links to the IPSW files for all devices plus a write up on how to install.


Hope this helps you too.

Jun 5, 2018 12:03 PM

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Jun 5, 2018 8:00 PM in response to Matzky In response to Matzky

Same issue with iPhone 6s Plus. Overnight went from ~70% to 8% in the morning. Only solution was to downgrade back to 11.3.1. Everything back to normal since. Apple has become a disgrace everything for them is revolutionary but it is total garbage.

Jun 5, 2018 8:00 PM

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Jun 5, 2018 9:31 PM in response to Matzky In response to Matzky

Well, then I woke in the morning and found that 50% charge had disappeared overnight... reverting all devices back to 11.3.1

Jun 5, 2018 9:31 PM

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Jun 6, 2018 4:25 AM in response to phil_anthropist In response to phil_anthropist

I have that same experience on iPhone 6S plus. When WIFI is ON, battery is draining 32% per 4,5 hours. When WIFI is OFF, battery is draining 1% per 4,5 hours.

Before upgrade to iOS 11.4 iPhone working 3 days on battery. Now I must rechable 2 times per day.

It is crazy! Apple please fix it ASAP. Iphone is now unusable.

Or allow easy downgrade (from iPhone without PC or mac) to version iOS 11.3.1

Jun 6, 2018 4:25 AM

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Jun 6, 2018 4:48 AM in response to pavel53 In response to pavel53

Hi Pavel, you can downgrade to 11.3.1 by downloading the IPSW file for your model (searching on osxdaily dot com for IPSW 11.3.1 will give you the links to the respective file on Apple.com.)

Connect your phone to iTunes after the file has downloaded.

Select the iPhone icon in iTunes.

Select update phone whilst at the same time holding the option/alt key. This will open a window where you can navigate to your downloaded IPSW. Select open and follow the steps on screen. let the process finish without disconnecting your phone.

After reboot your iPhone will be restored to 11.3.1

Jun 6, 2018 4:48 AM

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Jun 6, 2018 5:22 AM in response to Zide99 In response to Zide99

Had the same problems on my iPhone 6S with battery health at 97%. Battery would drop before my eyes. Finally reverted to 11.3.1.


I don't use location services very much - most system ones are off and apps are set to only 'while using'.


I did notice battery usage by mail was much higher than normal.


Is it possible that exchange email with push is a culprit? Perhaps in conjunction with WIFI?


I do have two email accounts - one Exchange, one Outlook.com that are set up with push.

Jun 6, 2018 5:22 AM

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Jun 6, 2018 9:44 AM in response to ghunarsdad In response to ghunarsdad

It’s definitely WiFi related. But we don’t use exchange and still encountered this issue. Reverting back to 11.3.1 is the only solution I found. I tried the 11.4.1 beta but that didn’t make any change in the battery being drained.

Jun 6, 2018 9:44 AM

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Jun 6, 2018 10:09 AM in response to Zide99 In response to Zide99

Here are the results of my tests :

- iOS 11.4 with WiFi off : lost 1% / hour

- iOS 11.4 with WiFi on and a 5Ghz network : lost 12% / hour

- iOS 11.4 with WiFi on and a 2.4Ghz network : lost 1% / hour

In standby mode and no app opened.

Jun 6, 2018 10:09 AM

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Question: iOS 11.4 battery drain