is it just me or does iOS 11.4 drain battery life faster 🤔🤔
Have 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,Reset, Reset Network Settings, try resetting your network settings.
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.
OR
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 can, also, negatively 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
http://www.apple.com/feedback/iphone.html
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!
As a test, use cellular only.
I have TWO 6s, one old one less than a year and iOS 11.4 is a WiFi problem affecting the battery. Go ahead. Try it.
But a temporary work around. Try that. Just for now.
The only thing that has helped me extend the battery life is to turn off WiFi. Terrible solution and this is a bug that Apple needs to fix as soon as possible but at least it's a temporary work around. Definitely not ideal if you don't have an unlimited data plan 😟
Resetting the network settings will change the phone name and clear all network settings!
Great, solves nothing, identifies nothing! It is the shotgun approach.
i have stated before that all texts and messages are now automatically backed up to the cloud, including images.
everyone with this problem needs to segment their phones networking into wifi, Bluetooth apps and usage.
i know that the problem with my SE is Bluetooth and Carplay/hands free. I just turn off Bluetooth especially after using my car. If I dont, I can guarantee that I will have a flat battery in the morning. Now, when I go to bed, my phone is charged to 100%, in the morning it is 99%.
Per Apple - 11.1.4 does NOT fix the slowness or battery drain issue. If the issue goes away after installing this update then it is a one-off.
And per Apple if a full restore and setup as a new iPhone solves the issue - there's no bug to fix, they will not have any "Updates" to address this issue.
In addition - Apple states that if the issue persists after a full restore and set up as new iPhone - then the issue is hardware related and to bring your phone to a local Apple store.
I have had my iPhone 6S Plus for 3 years now and never did a clean restore / set up as a new iPhone in over three years. I noticed the phone was getting very sluggish even before the 11.4 update. To my suprise when I set the phone up as new - it is VERY fast now - it even seems more responsive than when I first got it.
My recommendation is as follows:
1) Do a full BACKUP to iCloud and to iTunes
2) Do a full restore and set up phone as New (DO not restore the backup)
3) Re test - if battery drain goes away, then you know it is something which you had on your phone which is not fully compatible with the 11.4 upgrade.
4) Feel free to restore your backup - but note the battery drain may come back as a result of restoring.
5) If you decide to keep your iPhone as new - go ahead and manually reinstall your apps, and make your configuration changes - keeping track of what you are doing. At some point down the line - your phone might start to consume the battery abnormally - then you will know what app or configuration change caused it.
I had this problem, but switching from 5G wifi to 2.4G stopped the insane battery drain. Hope Apple fixes this with their next update, so we don't need to use this workaround.
Hello, try to disable HANDOFF (Settings->General->Handoff).
This working for me (Iphone 7S/IOS 11.4), waiting for an Apple fix.
Lots of involved stuff here. I toggled the HANDOFF 'enable' to > OFF- problem solved on my 6S.
You can't go back to 11.3 either- too late. Even if possible, any backups would have been 11.4 and you 'd be back where you started.
Hope it works for some / all.
And- where is Apple Support in this fiasco? They stay silent until they can slip-in a bug fix in the software? Poor support.
Maybe the real reason is related to Cook's diatribe against trying to use iPhones to data mine. Have we all been hacked and mining is going on?
-Gary
I was also noticing that the majority of the drain seemed to occur at night. I turned on airplane mode last night and my battery stayed charged. Based on that, I am assuming that there is some background processes running at night that I will need to research further. I'm pretty good about not keeping too many apps open at once and closing most on a regular basis, but I will update if I figure out exactly what is happening.
Regardless, my phone usage has not changed between iOS(h!t) versions so it still seems like an upgrade issue with 11.4...
Having initially had this problem (see my earlier post), I simply continued to ride out the issue and now, about a week and bit after I posted the intial problem, battery life seems to have settled down somewhat without me doing anything at all. From 100% at 11pm last night, left on bedside table (not plugged in) and battery only dropped to 98% by 7am. My guess is that the update just needed to do a lot more background indexing etc over the course of a couple of weeks.
I’ve had luck only using 2.4 ghz network yesterday. Reset Network Settings has worked so far on one device that is now connected to 5 ghz WiFi.
It will rename your device. So. Be sure that if you have it named “**** iPhone” after a network reset it will then just be “iPhone”. The Apple geniuses didn’t believe me. I showed them it was true.
Try it. 
[Edited by Host]
I downloaded 11.4.1 and my iPhone 6s is back to normal. I switched my wifi from 2.4G to 5G and battery drain is what I would expect. It is not excessive. However, I don't know whether or not the update fixed the problem or it was something else. Someone much earlier in the thread speculated that there was a lot of indexing or searching going on after the initial update to 11.4.
Well not me with my iPhone 6, 6s, 6s Plus, 7 & 8 Plus with iOS 11.4
Make a genius bar appointment with Apple for an evaluation.
They have tools that can check your iPhone's battery.
The fix for me is to connect to 2.4GHz wireless networks.
Well. That’s crazy. Even iPhone X’s have been affected. Changing to my 2.4 WiFi was the only thing that worked.
iOS 11.4 was killing my battery life on my iPhone. I re-installed it using several different methods but the battery life issue remained - finally tried iOS 12 beta 1 - works great - battery life is awesome - occasional issues with push email (email arrives when you open the mail app though) but that's a small price to pay. I put a link on my web site how to install it at https://www.VanFM.com
iOS 11.4 battery drain
