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 Oct 3, 2025 6:20 AM

You’re not taking into consideration the extra processes that go on after an upgrade (from 18.x.x to 26.x.x) and then an update.


Please update all your apps. Third party apps may not have been optimized for iOS 26 yet and that can cause severe battery drain. After updating your apps, please do a forced restart and give things another few days to settle in.


Force restart iPhone - Apple Support


344 replies

Oct 22, 2025 7:57 AM in response to azarudeena

azarudeena wrote:

Same issues for me as well, battery drains very fast, i’m really missing os18 i really don’t like 26 becuse of its performance. i feel like to move android. cant tolerate the battery issue

You might want to review the Android/Samsung forums before making a move to Android. There are similar posts here about battery draining after they had received an update, and funny enough some even say they are going to move to Apple.

https://us.community.samsung.com/t5/Galaxy-S23/Update-causing-Battery-drain-S23/m-p/3234875


Nobody knows what very fast means in your context because there has been no information provided. We also have no idea what you have tried that has been suggested here, so it is entirely possible you will have to wait for the next update to see what happens.

Oct 23, 2025 12:30 PM in response to JenKelowna

It is not that Apple does not support users with a previous version of iOS, it is that there is no supported way to go back to a previous version. The same is true for Android devices. All shipping releases of iOS are still supported and I still receive updates even for a device running iOS 16.


We have no idea what your conversation with Apple entailed, so do not know if that had you perform a Factory Reset with a computer or if they performed remote diagnostics. I have seen no reports of not being able to drag and drop app on the Home Screen as being a bug in iOS 26.0.1.

Oct 24, 2025 1:46 PM in response to andrea_filice

EDIT: I just checked I’m still on v18… So this might not be a version 26 issue

Maybe a different change?


Hope they fix this glitch


didn’t know about it until today

I charge my phone to 85% every day and always have enough to get through the whole day

Today it was fully charged like always, went shopping and checked my shopping list a few times & the stores app(do this many times a week)

When getting in my car I noticed phone felt hot, but put on wireless charger for 10 minute drive, stopped at my parents, pulled phone out of my pocket to show something to mom, and noticed phone was only at 16% 🤷

Then drove 5 minutes home, pulled out phone and was at 1% , looked at “Battery” in settings and didn’t notice anything odd, Safari used most power, then it shut down

I can’t have my phone dying in less than 5 hours!

was going to buy the new 17Pro since going on a trip in a few weeks, but not if it has these problems!

Oct 25, 2025 8:51 PM in response to andrea_filice

After i updated to 26 what started as a battery that seemed to die very quick has now turned into multiple times today my phone has been over 50% and has froze, shutoff, turned back on, and only has 10% left. Please make it make sense. Before this i could watch my battery countdown like a timef when it got to 15%. Ive had the update plenty long enough for it to have “merged” or whatever youd like to call it with everything on my phone. I guess their ways to get you to buy a new phone worked. Loved my 13 pro till this

Oct 25, 2025 10:58 PM in response to Sethtillman2

And what is your Battery Health at Settings > Battery > Battery Health > Maximum Capacity? If it is below 80%, it is time for a new one. It was only designed to last 500 charge cycles and if that is an original battery on an iPhone 13, then you are likely overdue. The "merge" you refer to is actually the background indexing of files and photo optimization for object detection, but that only takes about a week. If your Battery Health is below 80%, it makes no difference if that has completed or not, your battery would still need to be replaced by Apple.

Oct 29, 2025 3:04 PM in response to andrea_filice

4 min of YouTube draining 10% is for sure normal 🤣. I used to watch 45 min for 10% with iOS 18. I used my iPad 20 min today and it’s down 21%, if that not an issue I don’t know what is. Even if Apple fixes it in 1-2-3 months, the battery is also ruined by many more cycles than necessary. I think it should be looked into urgently and Apple should really focus hard on avoiding this on each update. It’s happens almost every time a new OS is released.

Oct 30, 2025 10:41 AM in response to Mac Jim ID

I updated over 2 weeks ago. Indexing was over long ago.

4 days with barely any usage, 21% in a day is really not ok when with ios18 on the same device it lasted 3x longer. I use the iPad only after work for 30min or so, it used to last 2 weeks between charges, now 3-4 days. The issue is if I really use it for a couple of hours it depletes the battery completely.

Oct 31, 2025 4:31 AM in response to andrea_filice

The same issue is happening with me in my model 13 pro , replaced new battery og from apple service on 1 may 2025 after updating to ios 26 my battery issue started coming sometimes it stop charging when i plug in , and from a week a highly major issue is coming ie my battery is draining unnecessary without touching at night drop was of 15-20%




[Edited by Moderator]

Battery Drain on iOS 26 and iOS 26.0.1.

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