iOS 11.4 battery drain

Good work Becha.

How do you know that the iPhone disconnected and reconnected from/to WIFI? Did you see the fan icon disappear and re-appear?

Why does this only happen to some people? Is there something particular in the 5GHz part of their router setup?

I only had 11.4 on briefly but yes, when I examined my iPhone 6S in the morning (I use 5Ghz on an R7800, channel 44) mail had used 60% of my battery. It usually is around 10%.

Same problem here with my iphone 6s running ios 11.4.

The standby mode current is supposedly under 1mA.... See how much it drains on my sleeping iphone 6s.

This is not a battery problem. The external power supply is wired directly to the board.

http://ezyeh.net/~ezyeh/551179800.124693.mp4

My home wifi router is set in 2.4GHz (chan 11). I also see a battery drain with ios 11.4 even in 2.4GHz Wifi band.

But when I disable wifi on my iphone 5s, I see improvement in the battery discharge time. When I switch off and on my phone, I see abrupt reduction in my battery %. For example before I switch off my phone it was 41% and after immediate switch on it is 20%. I have disabled Wifi in my off-on experiment.

It is not just an error in the battery % computation by ios because I also notice my phone getting heated up suddenly during the drastic battery % falls.

One correction: The abrupt battery discharge during switch off-on experiment is not reproducible. Right now when I switched off and on (with Wifi disabled), I can see only battery drop from 48% to 44%. 2 days back it was 20% drop.

I'm not sure how to interpret "5g WiFi" since my understanding is that 5g is celluar data and not WiFi. Regardless, the power drain is definitely related to WiFi and is NOT specific to WiFi band. I turned WiFi off all day yesterday and my phone, after some calls, music playing through bluetooth, and normal app usage was still 79% charged at the end of the day.

Prior to that, I tested both WiFi bands individually here and saw dramatic battery drains on both. This is on an iPhone 6s with a battery that was replaced by Apple in the store about two or three months ago. I have restored the phone and done a Network Reset several times since 11.4 caused this problem.

Hey everyone,

since my phone was almost useless due to this issue I decided to install 11.4.1 beta 3. For anyone else who, like me, had never installed a public beta before, it's no big deal, you just need to download a profile and then update from "Settings" as any other normal release.

Being idle, the draining has completely stopped, back to normal as in 11.3 or even better. In use (screen on), however, the unusual draining remains (1% every 20 secs or so, sometimes dropping 2% or 3% at once). An improvement nonetheless - now I can leave home without the charger 🙂

Hope it helps

I talked to Apple Support twice and they suggested doing a restore to factory settings. I did this and set up my 6S from iTunes backup but battery is still draining. Has anyone tried "set up as New iPhone" option? Apple needs to do a bug fix for 11.4!

Frustrating!

Yes, i did set my iPhone 6S up as a new iPhone. But it did not help.

The Battery is draining while using the phone as before. But in my case it has nothing to do with WiFi.

The standby time is great, but when im using the Phone i can see the % going down and down...

Battery lifetime before 11.4 two an a half day. Since 11.4 whith normal usage, a half day.

Hi,

i've done yesterday a factory reset and installed a selected installation of my favorite apps (iPhone SE 64G). Over 8 hours at WLAN there where no mignificant changes. Battery runs well, no drain.

Over the period of about 8 hours, no problems were seen. Then when I configured my two Google Mailaccouts in the Mail app did the battery begin to lose its capacity. In 30 minutes that was about 30%. Now i've deleted my two accouts and the battery is doing well again. I'm confused about that, using now GMails app...

But i have this since iOS 11.3.x

Regards - machnetz

I also have Google Mail accounts and when my battery was haywire on 11.4 I saw Mail was the highest battery usage offender.

Another user has speculated that when a 5Ghz WIFI connection is lost and then reconnects, the current app could go into some loop, so perhaps that happened with Mail. Or maybe there's a sync problem with Google Mail. I also have two Exchange accounts.

I had tried to restore 11.4 as new but no luck.

I am back on 11.3.1 as I downgraded when still possible.

tried this the day after you suggested and did not seem to make a bit of difference. I have my brightness about as low as it can go with me seeing anything and still the drain is more noticeable than any other OS update I've ever done.

I had a new battery fitted by them which unfortunately coincided with the iOS update so i thought the new battery was faulty but now realise its got to be the update, I reset as new iPhone for 24 hrs as apple recommended to me and that didn't work, they then said i should try it for 7 days which I'm currently doing, its still draining fast.

This battery drain issue on iOS 11.4 is NOT across the board for every compatible iPhone model.

My wife's iPhone SE is running very well on iOS 11.4 with no battery draining issues.

What have YOU done to improve your battery life on your iPhone.

Here is what I routinely do with ALL of my iDevices to optimise battery life and improve iDevice performance.

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.

Try re-adjusting your iPhone’s screen brightness to a lower, but still comfortable intensity.

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.

Good Luck to You!

I have the same issue. But the thing is, I updated (11.4) my 6S a week ago, and noticed just today how my battery drains faster than how it behaves days ago. My battery was at 67% 2 hours ago, then it went down to 25%. Perplexed, I used it and then jumped to 21%, then the moment I was about to turn the screen off, it warned me about 20% battery. It has been almost a year that my battery health's max capacity shows 84% up to last week. Then today, upon checking, it went down to 82% like real quick. Hasn't even checked it at 83%. Apple must do something about this.

I think that is missing the point many are making. Their phones were in a good state of health as, like mine, their battery lasted for days without having to charge. After the 11.4 update, their phone started draining power at an alarming rate, some phones even getting very hot. They have done nothing to cause this other than installing this update. Many have tried the basic steps that have been recommended without success, including a restart. I think most people know that this is something one has to do, but actually when the iOS update installs, it does it itself anyway.

The point is, many have spend a lot of effort to fix their phone, but why should they have to just because they installed an update? The responsibility lies squarely with apple. If they create a system that can cause these kind of issues, even if it was peoples setting, it is their responsibility. As there are so many people effected by it, it is clearly a systemic fault which through the complexity of the iOS only affects a subsection of the iPhone population. Only apple can resolve systemic faults. Although we may be able to disguise it/work around it by changing a setting here or there, the systemic fault will continue to exist and catch out others over time. The systemic fault needs to be addressed by apple. We cannot do that.