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


359 replies

Oct 4, 2025 3:57 PM in response to andrea_filice

The 26 & 26.01 updates are DRAINING MY BATTERY! I text all day for my work and from 7:30am-12pm my battery is down below 40% I can barely make it to 3:30pm without being under 15%. This is total BS and needs to be fixed ASAP! I don’t appreciate having to buy more power cords and blocks to now try and charge on my 30 min lunch break! Apple ****** me off. Let us decide what features we want. FIX THE BATTERY!

Oct 4, 2025 11:10 PM in response to andrea_filice

the truth is ios 26 has battery drain issue ,some are saying use power save mode ,,why we use in power saver mode thats ios pblm not our pblm , i am facing huge battery drain in 26 ios then i update to 26.0.1 but still same issue ,, in have updated all apps and its been 20 days still facing battery drain issue ,, and there is no option to change to previous 18.5 ios ,, 70% battery when is restart it gets 64% ,, phone iphone 15 plus ,,,

Oct 5, 2025 3:39 PM in response to andrea_filice

My battery health the day prior to upgrading (tongue in cheek) to iOS 26 was 100%. One week after the download my battery health was down to 88%. This seems to be the least transparent attempt by Apple to attempt to force me to buy a new phone. These kind of things are what cause brand loyal people like myself to consider other options. Time to admit you have a problem and get it fixed!

Oct 6, 2025 6:03 AM in response to andrea_filice

Same problem, I am also facing the battery. Train is super fast as compared to iOS update 26. After updating iOS 26 battery without using any single time of phone, the battery trains 95 to 20% in just 5 to 6 hours Before update iOS 26. The battery life is so good. I am not charged twice a day, but in after updating iOS 26 charging three times a day, even it is not fulfilled

Oct 6, 2025 7:38 AM in response to Goofy25

Exactly! I have a 2 year old 13 with a strong battery that gets only nominal usage during the day (I typically see 3 days of battery life between charges) and is presenting the same symptoms you described. I was planning to upgrade to a 17 around Thanksgiving but, Im disinclined to invest further $$$ into the Apple rabbit hole. The promise that it will all be fine after a few days is false, and blaming non-Apple apps is a cop-out. My phone gets hot when making a phone call - is the phone app not an Apple app? Considering Samsung….Best of luck to you!

Oct 7, 2025 6:33 AM in response to andrea_filice

I have had the same issue. My iPhone 14 battery health was 86% before the update, after the update, in 3 days my battery health went down to 75%. Each day got worse my phone now dies at 98% turns on at 10% then dies again, I charge it and it take about 20 mins to go back to 100% then does the same process over again. I never had an issue before this update. My sound also goes up and down on its own.

i had a 7 plus years ago with battery health of 72% and never had this issue at all.

Battery Drain on iOS 26 and iOS 26.0.1.

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