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Just thought I'd add my experience.
Have an iPhone 8 and a was similarly getting dreadful battery life - about 6% drain per hour whether I was using it or not.
Tried turning off new features such as Screentime as well as some other apps, but made no difference.
Looked at this forum and reminded me about draining until the phone switch itself off and then charging to 100%.
Did that and it seems to have cured it. Last charged to 100% at 11pm and still at 100% at 8.30am this morning.
Remembered that I had to do something similar for my iPad a while ago after a point update caused a similar battery issue.
Hmm I did this right after upgrading to iOS 12 - may be why I never noticed any problems? It's worth trying anyway.
 
I have an iPhone XS Max. It is 1 week old. Surely this isn't a good idea? Total drain is bad for these batteries as well.
The software prevents a true total drain just like it prevents overcharging. An occasional discharge to zero, I mean say once a month or every two months or exceptionally after a major iOS update won't harm the battery. Avoid in daily use though - try not to let it get less than 30-40 percent or so.
 
I’ve got this problem now. iPhone 7 is fine, but my iPad 2018 today is draining like a beast. 5 hours screen time and I’m down to 35%; that never happened before. 30% is Pages, 35% Notes; the rest is all the rest. Very weird. And I’ve still got to use it some hours yet!
 
I've noticed Siri has been a battery drain hog ever since I've updated to ios 12 and followed me over to my XS max. I dont use siri at all. Any ideas?
 
Siri for me has been ok. I’m gonna try and let my battery die and see if after going to 100% again things improve...
 
Didn't do me any good. Just like the advice to turn off screen time monitoring...didn't do much if any for my SE.
Same here, iPhone SE with 20-30% less battery power over a day's light usage. The above solution hasn't helped at all I'm afraid :(
This battery drain started as soon as I installed IOS 12, the day it was released.

Cheers :)

Hugh
 
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Same here, iPhone SE with 20-30% less battery power over a day's light usage. The above solution hasn't helped at all I'm afraid :(
This battery drain started as soon as I installed IOS 12, the day it was released.

Cheers :)

Hugh

I even did the 'drain and charge 100%' cycle a couple of times to no use.

A totally usable device under iOS10 is now crippled. Thanks to whoever suggested iOS12 was worth any ounce.
 
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If I were you I would sue Apple to compel them to give you a new device suited for iOS 12.

Since there is proof this is caused by iOS 12 and even replacing the battery didn't help, you obviously have grounds to file a lawsuit for planned obsolescence. Gather all evidence you can and do it, don't waste more time.

In my opinion the update was worth because there were improvements and I haven't experienced so far any battery reduction. At least I haven't noticed since the release (using the IPP 10.5, 256 GB wifi+cell).
 
You guys need to restore the phone using iTunes and SET IT UP AS NEW. Just a restore won't help if you're restoring your old backup. The backup is the culprit here. It has to be set up as new with no prior backup restored. A fresh phone so you can start from scratch. Signing into iCloud will sync back your notes, messages and contacts. You'll just need to redownload your apps.

Try it. Worked for me.
 
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No restore doesn’t help at all. Xs max user from X. I did a clean setup and draining is still an issue....I can get almost 20-30% better battery than my X which was dead at half the day but still it’s MEDIOCRE. I can’t believe it how bad the battery is.....if that’s their way to boost all iOS devices with iOS 12 and make them feel blazing fast then I prefer older iOS versions with bugs. Bugs > battery draining
 
No restore doesn’t help at all. Xs max user from X. I did a clean setup and draining is still an issue....I can get almost 20-30% better battery than my X which was dead at half the day but still it’s MEDIOCRE. I can’t believe it how bad the battery is.....if that’s their way to boost all iOS devices with iOS 12 and make them feel blazing fast then I prefer older iOS versions with bugs. Bugs > battery draining

How can you tell it's iOS 12's fault on an X Max? It only came with iOS 12. There's nothing else to compare it with.
 
There is a way to calculate the real usage. Only mark the times after charging and use the calculator. I had 40% when I was going to bed and calculated only 4 hours of usage on my 6s plus. The battery is fine but iOS is eating it. In the past I was going to bed with 60% of battery.
 
An update on my XS Max (and yes I feel silly now).

I use Overcast and I switched off the auto sync to watch feature. So far, no more battery drain. So far.
 
I've just watched my SE drop from 52% to 35% battery in about 2-3 minutes, after merely updating three small apps on the App Store. After that it settled down again and no further rapid loss of %.
Is this normal - no way is it :confused:

Cheers :)

Hugh
 
I've just watched my SE drop from 52% to 35% battery in about 2-3 minutes, after merely updating three small apps on the App Store. After that it settled down again and no further rapid loss of %.
Is this normal - no way is it :confused:

Cheers :)

Hugh
Is your battery in good shape? Something like that usually would be related to the battery not being in that good of a shape.
 
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Is your battery in good shape? Something like that usually would be related to the battery not being in that good of a shape.
It's on 85% according to the Battery App, but it's been working fine up 'till the upgrade to IOS 12, then suddenly I get extreme drops for a while.
It's steady at 34% now.

Cheers :)

Hugh
 
It's on 85% according to the Battery App, but it's been working fine up 'till the upgrade to IOS 12, then suddenly I get extreme drops for a while.
It's steady at 34% now.

Cheers :)

Hugh
Well, 85% isn't that great realistically speaking. While iOS 12 might be playing a role there somewhere, it does sound like at least part of it if not a lot of it is likely related to the battery not being in that great of a shape.
 
Well, 85% isn't that great realistically speaking. While iOS 12 might be playing a role there somewhere, it does sound like at least part of it if not a lot of it is likely related to the battery not being in that great of a shape.
Hmm yes probably, but how can it be explained that so many people have had these sudden losses of battery power just after upgrading?
I'm considering a battery replacement anyway, but may wait until after IOS 12.1 and see if there's any improvement.

Cheers :)

Hugh
 
Hmm yes probably, but how can it be explained that so many people have had these sudden losses of battery power just after upgrading?
I'm considering a battery replacement anyway, but may wait until after IOS 12.1 and see if there's any improvement.

Cheers :)

Hugh
Can be something related to iOS 12 not working as well with batteries in poorer health and/or something more related to iPhone SE in particular even (some threads like https://forums.macrumors.com/threads/battery-health-95-significantly-degraded.2145794/ kind of demonstrate that some more).
 
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Hmm yes probably, but how can it be explained that so many people have had these sudden losses of battery power just after upgrading?
I'm considering a battery replacement anyway, but may wait until after IOS 12.1 and see if there's any improvement.

Cheers :)

Hugh

I suppose there's some remote possibility that it may be related to the scheduler changes in iOS 12. The frequency now ramps much more quickly (and so should complete much more quickly). In theory that should actually save power with this notion of "race to idle" but perhaps with a bad battery in the mix it has a negative effect. I dunno. Just a thought. I'd definitely get that battery replaced before the end of the year though.

You can read about this scheduler change in Anandtech's XS/XS Max review. They also tested older chips.

https://www.anandtech.com/show/13392/the-iphone-xs-xs-max-review-unveiling-the-silicon-secrets/5
 
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Just thought I'd add my experience.
Have an iPhone 8 and a was similarly getting dreadful battery life - about 6% drain per hour whether I was using it or not.
Tried turning off new features such as Screentime as well as some other apps, but made no difference.
Looked at this forum and reminded me about draining until the phone switched itself off and then charging to 100%.
Did that and it seems to have cured it. Last charged to 100% at 11pm and still at 100% at 8.30am this morning.
Remembered that I had to do something similar for my iPad a while ago after a point update caused a similar battery issue.

I thought the advice was not to drain LI-ON batteries. In fact best not to regularly drop below approx 30%.
 
I thought the advice was not to drain LI-ON batteries. In fact best not to regularly drop below approx 30%.
Best, sure, but the difference between best and not best isn't something that will really result in something that will truly be all that noticeable.
 
Does turning off screen time really work?
Nope; I turned it off as soon as I upgraded, and before I knew there were battery issues.

Incidentally, my one year old Watch on OS5 dumped all its battery a couple of nights ago and was in the red the next morning - is there a connection here?
I can normally get 2 days out of it by the way, same as my SE used to be ;)

Cheers:)

Hugh
 
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