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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 12, 2018 12:13 PM in response to Zide99 In response to Zide99

To everyone having battery issues on iOS 11.4.

What has everyone tried?

Have any of you tried a hard reset of your iPhone 6/6S by holding down both the Home and sleep/wake buttons until your iPhone goes to black and restarts with Apple logo, then release the buttons?

How much free data storage space is left on your iPhone?

iDevices need to always maintain, at the very least, between 2-3 GBs, OR GREATER, of free data storage space.

In Settings app, under General settings, Reset panel, at the right bottom of the list, Reset All Settings.

In Settings App, Battery, check to see if any apps/processes are eating up your battery.

In Settings app, General settings panel, turn OFF Background App Refresh for any apps you feel do not need constant data updating/Internet updating in the background when not using the an app OR turn OFF Background App Refresh entirely/globally for the entire device.

Do the same in the Settings app under Notifications.Turn off notifications for apps you do not think you need notifications for and/or edit the different ways you receive notifications to help with performance by not always using all the notification methods together.

In Settings app under Mail, you may want to set a longer fetch time or set your iOS Mail app to only manually fetch your mail ONLY when you launch the iOS Mail app.

In Settings app (NOT from the iOS Control Panel) turn OFF Bluetooth when not using any Bluetooth devices.

Also, in general, if you want a faster IDevice, on all of my iDevices, I turn off most of the iOS motion graphics eye candy, by simply turning ON Reduce Motion in Settings app, General, Accessibilty settings.

Make sure you aren't running 30 -50 OR EVEN MORE background apps in the iOS 11 Control Panel/App Switcher.

If you are, you need to quit the bulk of these background running apps by tap and hold a finger on an app window in the switcher and slide your finger upwards to quit an app. You should be able to use more than one finger to quit more than one app window simultaneously.

Also, make sure you don’t have 20-50 OR A WHOLE LOT MORE of active website tabs running in the web browser.

If you do, greatly reduce the amount of active website tabs your web browser.

Some minority of user have been turning ON and leaving ON iCloud backups continuously backing up on a constant and daily basis.

If you are one of these users, in Settings App, tap your Apple ID, then tap iCloud, then find iCloud backup and turn off iCloud backup and only turn this on to do daily backups either when you are not using your iPhone for a prolonged period of time (like when you are sleeping), then turn iCloud backups OFF when actually using your iPhone.


Only perform your backups on a lesser time schedule.( like twice a week, once a week, once every two weeks, once a month, etc.).

Any large amount of background running apps or active processes that have to constantly go out to the Web to fetch data ALL THE TIME is going to slow down ANY iDevice and also, severely impact battery life.

In addition to all of the possible fixes and solutions presented, another iPhone 6S user, in another single posting in the iPhone support communities, suggested to go into Settings, General, Accessibility, Increase Contrast and turn ON Reduce Transparency.

Your iPhone 6/6S won’t look as pretty, but that user reported that his iPhone 6/6S speed improved considerably.

If none of this, so far, has helped your iPhone 6,/6S,

What about doing a complete backup to iCloud or iTunes on a computer, then do a complete erase and reset as new in the Settings app under General, Reset then restore your backup from iCloud or iTunes?

If still no joy after the erase and restore, hammer Apple with constant feedback about the iPhone 6/6S issues here.

iPhone Feedback

This is THE ONLY avenue to get Apple’s DIRECT attention to any and all iPhone 6 issues!

IF no one continues to post regular feedback about iPhone 6/6S issues, Apple will NEVER know there is an issue and will never correct it!

Cognizant Apple employees read ALL feedback generated from all of the various feedback pages and transfers the data to the appropriate Apple personnel , but NO Apple employees will ever respond with any type of direct, individual replies from the feedback you post.

Good Luck to You All!

Jun 12, 2018 12:13 PM

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Jun 12, 2018 12:19 PM in response to MichelPM In response to MichelPM

Hello MichelPM, I've posted this on other threads and people seem to be having success with it:

Try resetting your network settings under Settings > General > Reset > Reset Network Settings.

This appears to be a network connection issue and this could help a lot of folks out there.

Jun 12, 2018 12:19 PM

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Jun 12, 2018 2:07 PM in response to Zide99 In response to Zide99

iOS 11.4 causing massive draining on my iPhone 6, and I mean dropping 1% every 20 seconds at times. Battery health is ok and I'm connecting to 2.4GHz WiFi. But even in LTE it does the same anyways.

I checked battery usage in settings and Mail app is hogging 70% of both time and CPU. So... potential culprit there.

I reset the infamous network settings to no avail, draining madness continues.

However, when I

  1. Switch on Airplane mode & turn off WiFi and Bluetooth (i.e. "isolate" the phone) > rapid draining stops (a bit obvious, but at least to have a starting point)
  2. Turn WiFi and Bluetooth back on > still normal consumption
  3. Switch off Airplane mode (i.e. back to full connectivity) > back to rapid draining - after a little while

So, could this be a cellular issue? I know having cellular on consumes more battery than having if off, sure, but the news here is that in my case wifi doesn't seem to be the issue.

Jun 12, 2018 2:07 PM

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Jun 12, 2018 2:21 PM in response to Zide99 In response to Zide99

I have experienced the same issue with 6s model (which I use for work). Literally drained my phone in less than 1 hour from full charge.

I did not experience the issue with my personal 7plus or my Ipad Pro. I changed my home Wifi from 5 ghz to 2.4ghz and so far that seems to have helped.

Jun 12, 2018 2:21 PM

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Jun 12, 2018 3:06 PM in response to Zide99 In response to Zide99

What I am finding now after having responded to this thread is that my battery life is being drained from the incessant emails notifying me of further posts about battery life. (For the North Americans, this is ironic). I wonder if anyone knows how to switch them off.

Otherwise the battery life seems to be getting a bit better this evening: it’s lost only 8% in over 7 hours, without resetting network settings.

Jun 12, 2018 3:06 PM

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Jun 12, 2018 3:17 PM in response to Zide99 In response to Zide99

There seems to be a bug with wifi in iOS 11.4. I had the battery draining issue on my iPhone 6s and disabling wifi, though not an ideal fix, has resolved the issue. I've had wifi off for several days now and the battery performance is back to normal.

Some people are suggesting that the problem only occurs when connecting to a 5GHz wifi network, whereas with 2.4GHz networks it is fine. I haven't tried that yet myself so can't vouch for it, but it might be worth a try if you can't do without wifi.

Jun 12, 2018 3:17 PM

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Jun 12, 2018 3:23 PM in response to Zide99 In response to Zide99

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

Jun 12, 2018 3:23 PM

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Question: iOS 11.4 battery drain