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 6, 2025 7:47 AM in response to andrea_filice

Thank you Andrea-Filice for your patience and persistence in this battle. I experience similar symptoms and have tried many of the “fixes” suggested by Apple with little or no success. I havent the time or patience to spend on it but will strive to endure until Apple truly corrects the problem, or I’ll explore Samsung options. Thanks and best of luck.

Oct 7, 2025 1:26 PM in response to andrea_filice

This is called obsoletion.

the iOS is optimize for the phone they want you to buy not the phone you have.

No matter how many things they’ll give you the option to turn off, the drainage will still be credited to all the new features causing the drain regardless if you turn off the features and never use them.


this message will self destruct in as many moments it takes someone else to censor it.

Oct 8, 2025 2:37 AM in response to Jeff Donald

Hi Jeff i see you here defending apple and blaming other apps. Here is mine for example from today. I have this since 26.0.1. Multiple restarts, adaptive mode on-off etc. Spotify running in the background 12%? It is a joke but let’s say it is not an apple app, fine. Home screen/lockscreen 5m 5%? Really? Messages 5m 3%? How is this not a clear ios issue? How didnt we have this drain on ios18?


[Edited by Moderator]

Battery Drain on iOS 26 and iOS 26.0.1.

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