Battery Drain on iOS 26 and iOS 26.0.1.

Good morning everyone,

I would like to report a VERY SERIOUS problem with the battery and performance.

I have a NEW iPhone 15 with 100% battery capacity and only 22 cycles (which I did myself; when it arrived, it was at 0).

However, after updating to iOS 26 (and even with iOS 26.0.1, the situation remains the same), I continue to have VERY SERIOUS problems with the battery life of my NEW phone.

Today, I was busy all day and did not use my phone from 8 a.m. to 4 p.m., yet it still dropped from 90% to 45% WITHOUT DOING ANYTHING. No apps were open, the “Refresh apps in background” option was not enabled, the screen was set to turn off automatically after 30 seconds, and automatic brightness was enabled. So it's definitely not the phone's fault because it's BRAND NEW with a 100% ORIGINAL battery, nor is it the settings because it was in PERMANENT POWER SAVING mode. So the fault lies solely with iOS. There are no excuses.

I am writing this message to urge Apple to resolve this issue as soon as possible because, from what I have read on X, I am not the only one.

Has anyone else had this problem?

Thank you very much and have a good day.

iPhone 15, iOS 26

Posted on Oct 1, 2025 8:07 AM

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Question marked as Top-ranking reply

Posted on Nov 22, 2025 7:04 AM

Followyoheart wrote:

1. Following can be tried depending on your risk appetite. May not be advisable from safety point of view and depending on how essential are these features to you but could be done until the iPhone stabilises after updates:
Set all mail accounts to fetch manual. New mail only arrives when mail app is opened.
2. Turn off Siri learning for as many apps as possible that is not essential to you. You will have to go Siri settings. I have a feeling that the Apple Intelligence and Siri are using lot of phone resources to learn from your apps and phone usage behaviour.
3. Background activity still happens even if you set background refresh off. You can see that in battery % used for apps. It shows on screen % and background activity %. Close apps on your drawer once done.
4. Location services off for all non essential apps. It can be turned off completely as well until required during navigation but this is risky and not advised (I believe ‘find my phone’ will lose access unless lost mode is enabled from other associated devices) and definitely not for people who tend to misplace their phones. I’ve seen location services running every time I unlock my phone. This does drain battery.
5. Lastly 26.1 seems to have improved the battery management. Not sure though. Do not forget to update all apps and do a force restart before these measures.

Yes, some may ask why bother buying a smartphone then but maybe as a temporary measure to save your battery performance until it’s fixed.

Disclaimer: At your own risk please.

Hello~ Have you tried this on your own device? Perhaps you should do so rather than post “Disclaimer: At your own risk please. “ Wow…


~Katana-San~

432 replies

Dec 4, 2025 2:18 PM in response to Mac Jim ID

It's hard to respond to such a condescending reply in a civil manner. But I see from your bio you're it support. So I guess I'll just chalk that up to the tone.


But I'm not some tech illiterate senior novice. My career with computers started in the 1980s with punch cards. My first computer language was fortran.


I stand by my original evaluation that the software is badly written. For something to draw that much power after a major iOS update and be hard to find and turn off is bad programing.

Dec 4, 2025 2:57 PM in response to oldmaninflorida

It's not bad programming at all, as each of the settings does something different (as was clearly explained) and the associated settings are in the location that makes the most sense for them.


The fact that you would prefer a different user interface does not make the programming "bad."


In addition to that, I'm glad it's solved your problem, but it's not the root cause of your issue since there are millions of iPhone users around the world who have all these settings turned on (including myself) and are not experiencing the battery drain that you are.


There is clearly some other factor involved, and it's not condescension to take a strict engineering approach to the issue and realize if it was poorly written software, everyone would experience the issue… and they most certainly do not.

Dec 9, 2025 6:08 AM in response to philhansen

This makes me believe that the issue from all the iOS 26 issues will get better.

my one big hope is the call block options will get back to a simple hit info icon on bad call/go down to block/tap and move on. It should even be easier & faster than that but I would settle for the old steps. I’ve typically been getting 12-15 phish,spam calls a day for ins, Medicare, Life and its an effort to delete now!!!

Dec 9, 2025 6:30 AM in response to jfbjabbmb

Most of the spam calls I receive are from spoofed numbers and that same number would not be used again for another spam call whether I had blocked it or not. The call blocking feature is only effective with legitimate numbers that you do not want calling back, it is not very helpful in reducing spam. That explains why you are still getting 12-15 spam calls after blocking the numbers.


Better solutions are sometimes found from your cellular provider where many use spam blockers, so they do not even ring your phone. Check with yours to see what they offer.

Dec 12, 2025 5:16 PM in response to snoopyq234

snoopyq234 wrote:

Iphone 14 pro max - 87% - no apps used during this time, just left on the table.

Can we all just agree there's a major issue with ios 26 instead of suggesting tweaks, app updates, and reboots. I've got multiple Apple devices with exactly the same battery drain issue - ipads iphones watches - only started happening since ios26.

Maybe if the battery app wasnt like my kids crayon drawings & had some decent system level cpu usage we could get to the bottom of this.

Ios 26.2 has not fixed the issue either.

Hello~ No …we can’t “just agree there's a major issue with ios 26 instead of suggesting tweaks, app updates, and reboots.”


~Katana-San~

Dec 12, 2025 5:34 PM in response to Katana-San

snoopyq234 wrote:

Can we all just agree there's a major issue with ios 26 instead of suggesting tweaks, app updates, and reboots.

No, we can't all agree. I've had zero, zip, nadda, no issues caused by iOS 26. In fact, to me, it's one of the most exciting iOS versions Apple has EVER released. You can speak for yourself, of course. But you do not, nor can you speak for the other millions upon millions upon millions of other users who may be out roaming around without any issues caused by this update.

Dec 13, 2025 1:09 AM in response to snoopyq234

Unfortunately Apple will not allow you to install latest update 18.7.3 released Yesterday because they are enforcing 26.2 on capable phones (like iPhone 15).

Latest iOS 18 release can be only installed on very old iPhones like XR/XS.

They really want us to move to 26.2.

I said it before and I will say it again I think 26 version will become stable for battery performance in mid next year (around 26.5, 26.6 release) in similar way it was for 18 version. History will repeat itself.

Battery Drain on iOS 26 and iOS 26.0.1.

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