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

Mac Jim ID

Level 9

60,914 points

Posted on Dec 12, 2025 7:06 PM

I would expect your Home & Lock Screen and Settings to be using more battery today after the update.

You still have not posted what apps are using your battery by scrolling down on your screen. Just because you aren't using an app does not mean it is not using power. The 2 you identified are the exact ones you would expect to be using your battery after an update for a short period of time.

In addition there is no word on your cell signal which is a major contributor to how much power is necessary to connect to your closest tower. The farther away it is the less bars you will have and the more power your device is going to use. The only thing that uses more power than a 1 bar signal is when it is searching for a tower.

If you post future screenshots, it is the green battery graph along with the apps consuming the battery that is the most helpful. The green graph shows rate of drop where the daily usage does nothing more than tell you what you have used. Leave it plugged in all night tonight and follow up tomorrow with your results.

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438 replies

Dec 19, 2025 11:01 AM in response to andrea_filice

Please help me update my iOS

sk8gal

Level 1

27 points

Dec 21, 2025 1:59 AM in response to lobsterghost1

Several charges later, it appears that the setting is being ignored altogether for both the iPad and the iPhone. It charges to 100% every time (unless I remember to check it and remove it around 80%)

sk8gal

Level 1

27 points

Dec 23, 2025 6:44 AM in response to Mac Jim ID

I did that two weeks ago. Everything is fine. This 80% battery charge limit is being ignored on both the phone and the iPad (the iPad is new). Something is amiss that is not specific to my devices.

Battery Drain on iOS 26 and iOS 26.0.1.