iOS 11.4 battery drain

I have this problem too. It seems like it is definitely something with the 6x models because it does not affect either of my iPads (3rd Gen and Air 2) or iPhone 8.

Tried a complete wipe and restore and it did not help. Deleted apps, turned off and/or limited location services and everything else I could think of and nothing helped.

I have also noticed that in addition to the general battery drain problem, there is some specific poor performance with photos and video. Anything that involves viewing, editing or sharing photos DESTROYS the battery charge. Simply opening Photos, viewing, cropping, adjusting and sharing a single photo can clip 10-15% off the battery. Viewing a video on a website is similarly lethal to the charge.

Well,

My wife “accidentally” updated her iPhone SE early this morning and over the air over Wifi, which I loathe EVER doing with any of our iDevices, and miraculously her iPhone has NOT been affected by the battery drain issue you all are experiencing.

After all of the “sky is falling” postings about the severe battery drain under iOS 11.4, I got really P.O.ed with my wife and told her to expect rapid battery drain on her iPhone SE, indefinitely, with no quick update fix coming.

But this appears to have never happened.

Her iPhone SE was at 88% at 6am this morning.

After the iOS 11.4 update and 7 hours later ( 1pm ), her iPhone is only down to 75%.

So, this does not feel like drastic battery drain to me.

She has both Cellular, Wifi and Bluetooth always turned on, but I have all of our iDevices setup per the extensive checklist I have been posting here and in other “iPhone battery drain after iOS 11.4” posts.

So, this battery drain issue is NOT affecting every iPhone currently able to run iOS 11.4.

I understand that you refer to battery life. Since that is the problem, but the cause is known. It is the update of the latest iOS 11.4. We as end users can not fix this.

Trust me. I tried :( can not even return to previous 11.3.1 anymore. :(

I have a new SE with 11.4 and experiencing unusual battery drain.

My problem is not so much the overnight drain or wifi issue as is just using the phone.

In particular I've noticed a drain while using Safari. In 5 mins of browsing the battery went down by approx. 10%.

I tried this a few times, both with cellular and wifi off or just wifi on.

I had another SE with 11.3 and the battery performance was much better.

To me It seems Eelco is right.

Wifi 5 GHz could be the issue.

At work on company's network 2.4 GHz Not much drain.

At home at the 5 GHz Wifi I can watch the battery percentage going down.

Network reset did not help..

It's not possible anymore. Apple stopped signing 11.3.1.

After a few days back on 11.3.1 I can confirm, that I reach 2,5 days without charging my iPhone (I'm not a heavy user...). It is a firmware bug and not a user problem!

I will be reverting my Iphone back to the previous version. It is gobbling up my power for a reason I can't find. Took my phone off the charger before I went to bed. It was at 100 percent. 6 hours later it's down to 80 percent and all I have on is WIFI. Something is wrong with this IOS.

I am also experiencing this issue with my 6s+. A few additional details I've not seen mentioned...

I've noticed it's not nearly as bad when I have a very strong cell signal. Unfortunately, my cell signal is very weak at home and the battery drains very quickly. I used to go the whole day and just be under 50% after a 16 hour day. Now I'm below 50% in 6-8 hours.

I've also noticed bluetooth performance became very poor after the 11.4 update. Every few minutes the audio became very choppy. After some experimentation I discovered that keeping my phone in airplane mode with wifi on would decrease the frequency of this. This led me to believe the battery drain was due to the weak cell signal in my home, but after a few days I can confidently say that this battery drain also occurs on airplane mode + wifi.

One final note, before the 11.4 update, battery health showed my maximum capacity at 100%. Since the update I've noticed the capacity slowly decreasing. It is now at 97%. Is it normal to loose this much capacity this quickly? Is the bug introduced in this update damaging, or at the very least over-stressing, my battery?

My husband and I have the same issue. He has the iPhone 6 and I have the iPhone 6S+. Both of our phones started having severe battery drain as soon as we updated. I used to go 4-5 days without a charge. Now I can't even go a day. I've turned off everything not in use and it's still horrible. Very, very unhappy with this update.

I have upgrade my iPhone 7 to IOS 11.4 and now my battery is literally lasting me 5 hours, sometimes even less..

so I change my battery and my screen (because there was a little crack) and paid a fortune..problem continue the same and after reading all the testimony in so many forums, found out that it was the IOS 11.4 bug.

Went to Istore to tell them about the problem and of course, they don't acknowledge anything! Unfortunately I can't downgrade my phone to previous versions because Apple has restricted all the links to downloads any previous versions.. that is very shity and obviously I am very disappointed with Apple. So now what? we are stuck with our expensive phones and we can't even use them properly without mentioning all the people that like me have spent a little fortune replacing their battery thinking it was our fault..

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.

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!

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.