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

Top-ranking reply

SirLauncelot

Level 1

14 points

Posted on Jun 23, 2026 12:35 PM

Possible FIX.

still have open feedback about this issue with screenshots on the feedback app. But, after purchasing a new iPad Pro because my iPad Pro 3 wouldn’t last, and got to the point it wouldn’t charge, I think I found the issue. I was noticing a lot of system apps we can uninstall, like mail, would have hours of background time. You can’t disable background updates for system apps. Even turning off all background updates, my system would run so hot, it refused to even charge. It got to the point I had to shut it down, and use a slow 15w brick to charge it.

i think I found the bug. Go into settings, apps, mail, accounts, and change fetch to manual. In automatic, it says it only fetches when charging and on WiFi, but I think that is the bug. I turned it to manual, and not I can lock my iPad and let it sit for hours and the battery is 98%. It used to be hot and about 20% after 2 hours. Now if I can get them to warranty replace my 125 cycle battery after only 3 months.

[Edited by Moderator]

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Battery Drain on iOS 26 and iOS 26.0.1.

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