iOS 11.4 battery drain

I just set background app refresh to WiFi only and switched off location services. Now my iPhone 6S appears to be back to normal. I’ll test put a few more scenarios, but that seems to be the basis of the problem.

Try turning off location services and background app refresh. Then switch them back on. I set my background refresh to WiFi only. Still playing with those settings to try and narrow down the culprit. I appear to have better battery management now bot won’t know until later today.

My suspicion is Apple have put a new API or rules for apps that call background refresh.

The only way I can conserve battery is to switch to Low Power Mode.

Yesterday I was able to go from 7:30 to 2:30 and go from 100% to 69%.

This included 3 hours on WIFI. All on Low Power Mode.

My Battery Standby was about 2.5 hour greater than Usage so I wasn't using it constantly.

When I did start using for Hot Spot then the consumption went down rapidly.

It would help to be able to leave 100% on low power mode and not have it reset when it reaches 80%.

There also must be something running in the background as the internet (hot spot) is so much slower than before.

Same here. I believe the problem resides with WIFi. My router and this is with my phone near it is showing a 20% loss of signal which can cause the phone to work harder to compensate. I know it’s not a network issue because I have other devices I’ve tested and they get full 100% signal. My older iPhone gets 100% but it’s using an older IOS. I think there is a bug with WIFi and Apple refuses to address it. I’ve beta tested IOS 11.4.1 and IOS 12 and neither addresses the battery drain. In fact it’s worse then it is now on IOS 11.4.

It is mostly because of the usage of the applications or there might be some changes in settings. if it is showing battery maximum capacity as 90% then it means there is some issue with the usage of the battery. Try one thing, put the your iPhone in charge when it is 15% and keep it in charge till 100% and do not remove it from charging. let it drain till 15% again. Do this 3 times. and turn off few notification in settings. It might help you.

Got really warm when WiFi was on while charging. I had pretty much everything turned off that you could on the phone in order too get longer usage, however even doing that and turning the screen brightness down as low as I could wouldn’t stop the battery drain. It’s almost llike something was running using heavy data usage. I’m on beta IOS 12 second release and they seemed to have fixed it.

I'm having this problem as well. I called support and they told me that I need to wipe my phone and restore. I tried that and it did not help. They now have told me that I should get the $29 battery replacement and that will fix the problem. It is frustrating that this problem coincided with the 11.4 release.

I posted in this thread a month ago. Since then I've tried all of the suggestions posted here other than trying the 12.0 beta. Most of the things I tried helped for a day or two but it keeps going back to the battery drain. I have a 6s, the battery is relatively new (replaced a few months ago) and the capacity is 93%.

Here's my experience...this is absolutely a wifi issue but it's not limited to 5.0 vs 2.4 and it's not constant. I have a modem and wifi extender at home. Both are 2.4. The battery drain happens to me only when I've been home most of the time (I work out of my house) and I think (but not positive) it happens only when I'm connected to the wifi extender. But it doesn't happen all the time. Some days I'll charge overnight, have 100% at 8:00 am and drop to maybe 70% by 5:00 pm with light usage. Other days I'll charge overnight, have 100% at 8:00 am and 30% by noon with very little usage.

I can't turn off the extender because we have other devices that require it. Tomorrow I'm going to try removing the extender from my wifi options on my phone and watch that for a few days.

The point of my post is, restoring to new, shutting off background refresh, other devices, etc...none of those things mattered for me. For me it appears to be only about wifi. If I find out in a few days that it only happens with my extender I will post back here AND contact Apple support. Good luck everyone!

As I reported a couple days ago I had the same problem but since I went through every setting and turned off things I don't use, charged my phone to 100 percent and rebooted it a couple times my phone is back to pre 11.4 status. I leave my wifi on all night (5G) It's still at 100 percent in the morning. I have been using my BT headphones for the last couple days and my battery level remains normal under the circumstances. Got me puzzled but I'm glad to be back to normal.

FIX 1: Problem with Wi-Fi

The problem may be with your Wi-Fi after upgrading to 11.4 some major changes happen on it. To rectify this by Switching from a 5GHz network to a 2.4GHz network. Otherwise, disable Wi-Fi.

FIX 2: Use iOS 11.4

Many people get fixed with this issue when they updated to iOS 11.4.1. But still some not get fixed with this solution.

For more details:

http://www.techmazza.com/ios-11-4-battery-drain-fix/

It appears that 11.4.1 has fixed the power drain problem for me but the fact that 11.4 caused it has eradicated what little faith I had left in Apple's software quality. My trust has been lost and I will not install any new IOS updates without a compelling reason.

So using 2.4G WiFi solves it for you. I said 11.4.1 fixed the problem for me but I have been using 2.4G WiFi at home when I used to use 5G. I don’t know what work uses but I have been here for 8 hours and the battery is at 96%.

BTW I noticed 11.4.1 changed the modem firmware version. I don’t know if that is used by WiFi.

I can confirm, that on 11.4.1 the poor battery perfomance has changed, at least for me, to the good. On 3 6s phones plus an Ipad Mini 4 (Wifi) the update delivered a stable battery perfomance, even better than 11.3.1. I've updated 1 phone via itunes and two OTA. The performance result is comparable without any issues for me so far.

Keep fingers crossed that it's going to remain stable...

Remark: I'm using a 5GHz WiFi network all the time.

I have been dealing with portable devices for decades and here is my observation with regards to iOS 11.4.1.

Until evening of 31st July my iPad mini 2 was working and behaving as it should. That evening I responded to the popup message requesting update to 11.4.1 and granted permission. The battery was at 98%. The next time I tried to use it the battery was down to like 40 % dropping first to 19% then to 13 % and finally to 1% in a matter of a few seconds. I simply could not get it to charge or go beyond 1%. It would show the desktop for a few seconds, then turn blank and come up with full white screen and a bitten apple in the middle.

Then I read somewhere that if I powered it off while in charging state with the lightning symbol visible next to the battery level indicator it would remain powered off. That is what I did. The nest morning the level went up to 60% but within a minute it dropped to 1% and went back to its old behaviour.

This morning I repeated the same process and let it charge for like 12+hours. When powered it on it displayed battery at 100%. Now comes the strangeness of its behaviour. Now without any rhyme or reason it jumps switches the display between 100% and 1% totally randomly.

As long as it displays 100% applications run fine. Soon as it switches to 1% the display blanks out and seems like rebooting it taking place. There is no way the battery can go from 100% to 1% and then back to 100% in a matter of a few seconds and that too with no charging cable connected !!! Only conclusion I can draw is that Apple screwed up somewhere along the line in the application or the code that checks the battery level and triggers a routine. Apparently it also screwed up in another area. If the device is left on while charging some routine prevents the battery from charging. This is from the USB meter I placed between the charger and the cable that measures and alternately displays the charging voltage and current. This was showing 5.1 V and 0.000A. Certainly not a good sign. However when I powered off the device when it was in actual charging mode then the current displayed was 1.2 A.

@docsair - Your experience is identical to mine save that my update from 10.3.3 to 11.4 was entirely unintended, undesired and immediately revealed to be the biggest disaster in my 25 years with Apple. iOS 10.3.3. was/is so superior to v.11, a product that was once a joy to use is now an irrevocable thorn in the side and hardly worth having. Like yours, my phone needs to be charged a few times a day to maintain simple functionality. However, forced by iOS 11.4.1., I've taken "power preservation" to an extreme level. In addition to having every conceivable setting powered off, check out these employed through the day:

1. Airplane Mode: On

2. Wi-Fi: Off

3. Cellular: Off

4. Low Power: On

Yes, these disable functionality; only when I want/need to use the phone do I switch on the appropriate setting, then back off it goes. Major pain. Why, it's like not having a phone at all! Such is iOS 11.