Worst battery backup after 26.5.2 update.

Sunny days use more battery as auto brightness is set at maximum.

Try Dark Mode, OLEDS use less on bright days.

ashis68 wrote:

Same with my iPhone 17 pro max.. it’s horrible

I haven't seen where you have posted the requested screenshots of your 2 battery graphs and the top 5 apps consuming your battery. Nothing will change just by saying your battery is draining, that requires the diagnostic steps that have been provided.

Barbababar wrote:

I updated on 26.5.2 the day it released: it's been bad ever since. Like losing 20% during the night bad.

You phone should be on the charger all night, every night and use Optimized Charging. Background processes are scheduled to run overnight while you are not using your device and it will continue to power the Cellular/Wifi antennas. The result is that you are increasing your Charge Cycles and result in your Battery Health degrading much quicker.

Also: I have the limit set to 85% to preserve battery, and now my iPhone tries to charge to 100% almost every time. It seems confused by what's happening too.

Your phone is supposed to charge to 100% periodically to maintain accurate charge estimates. If you are preventing that from happening, you will continue to see it attempt to charge to 100%. Don't bother with the Charge Limit and simply use Optimized Charging like recommended and charge your phone all night, every night. You are more likely to have your phone completely drain when you are only starting with a 85% capacity and that is the worst thing you can do for battery health.

• If you have Charge Limit set to less than 100 percent, your iPhone will occasionally charge to 100 percent to maintain accurate battery state-of-charge estimates.

About Charge Limit and Optimized Battery Charging on iPhone - Apple Support

iPhone 15 Pro Max - 87% battery capacity

It is not time for a battery replacement yet, but you are getting close when it will drop below 80% and need replacing. Your phone is expected to last 1000 charge cycles before that happens under normal use. With it being 87%, your capacity is already reduced by that amount and then when you add a Charge Limit of 85%, it will reduce your daily usage even further, so I could see where you are having to charge it during the day.

Let’s be honest: iOS 26.5.2 is a battery hog. And I’m tired of constantly reading the same nonsense about post-update indexing.

First, minor updates like this don’t trigger a complete reindexing of every single item on the phone. Second, even if they did, the phone should be fully optimized after 48 hours.

What’s been happening since updating to iOS 26.5.2 is terrible. My iPhone Air has 100% battery health and, until now, had excellent battery life. Since the update, its power consumption has increased dramatically.

And it’s not just a feeling — Adaptive Power Mode has started kicking in frequently. Previously, it activated maybe once or twice a month, for example when I was editing videos or doing something genuinely demanding. Since installing iOS 26.5.2, it has been activating almost every day — even though it’s already been a week since the update — during basic activities like scrolling through Instagram.

So clearly, something is wrong with the system.

I just tried something and I'm noticing much longer battery life. It seems to have worked for me, and I have an iPhone Pro Max 17. First of all, I set the battery to charge to 80%, and before charging I set phone to Low Power Mode. I left the settings on my phone exactly as they were and didn't try to squeeze extra battery life by turning off things that I normally use. After charging like this overnight, I noticed that the battery life is much longer now...

By the way, when the iPhone charges to 80%, the Apple software turns off the low power mode, and you're back to your original settings. Good luck and I hope it works for you.

I sincerely hope this isn’t the case and that Apple addresses these battery performance issues in a future update.

You are incorrectly hinting that the "issue" is affecting all users. Many millions of users have updated with no issues at all.

If there really is an issue, it's tough for the software engineers to figure out why only a limited number of users might be affected using identical hardware and software. We have 3 iPhones here that are all operating just fine....and have never had issues with any updates. The vast majority of users will say the same. You don't hear from them on this site, because users don't post here to say that they things are fine. They post to say that they are having a problem.

If there were a serious widespread issue, this support site and others would be completely flooded with posts and you would be hearing about the issue on the evening news.

Yes, you may have a problem, and you may need to take the phone in to be checked and tested. The real task might be to try to find out why so many millions of users are not having issues.

Its been a few days after the update and my iphone Air has 32% at noon. It was fully charged in the morning. i’m not using it excessively. this never happy to me before and I’m using iphone since version 3G

Cmegreen wrote:

Exactly the same with me on 17 pro max

Exactly the same recommendations for the requested screenshots. Most users have automatic updates for apps turned on, so even using the device exactly the same does not mean you will get the same results. Both requested screenshots for the 2 Battery Graphs and top 5 apps consuming the battery would be helpful to see exactly what is consuming your battery and the rate of discharge.

I've been an iOS user since iPhoneOS 3. I've never complained about my battery degrading noticeably after an update. I understand the concept of indexing.

I updated on 26.5.2 the day it released: it's been bad ever since. Like losing 20% during the night bad.

I had to change my charging habits, I'm now charging it multiple times per day. Also: I have the limit set to 85% to preserve battery, and now my iPhone tries to charge to 100% almost every time. It seems confused by what's happening too.

iPhone 15 Pro Max - 87% battery capacity

Barbababar wrote:

> You phone should be on the charger all night

I can charge my phone however I want to 🙄

> Background processes are scheduled to run overnight while you are not using your device

I think you're underestimating background processes. By that logic, night-shift workers would never see them 🙃

> Your phone is supposed to charge to 100% periodically to maintain accurate charge estimates.

I positively understand this mechanism. What I'm saying is now it's happening every day or every two days whether it used to happen once a month.

> It is not time for a battery replacement yet, but you are getting close when it will drop below 80% and need replacing. Your phone is expected to last 1000 charge cycles before that happens under normal use. With it being 87%, your capacity is already reduced by that amount and then when you add a Charge Limit of 85%, it will reduce your daily usage even further, so I could see where you are having to charge it during the day.

You're implying that I'm not able to judge if I lose more battery overnight. I've been living with that 87% battery for literal months. It only started being a problem after 26.5.2. I trust my own judgement on those kind of things. Also: tell that to the iPhone Air user who reported similar problems while on 100% battery health.

1. Absolutely, you can charge your phone when and how you want. You've just been given best practices advice, but you do what you want. As users only, we don't care when you charge your phone or whether you want to listen to the advice offered.
2. You are taking the background processes taking place at night too literally. Sure, there are people who work the night-shift. But they surely must find some other time of the day to sleep and if they plug their phone in to charge when they sleep, background processes will run.
3. Since battery health decline is not linear, it can remain steady for a while, then drop several points in rapid succession. Your phone will ultimately do that as batteries are consumable parts and they lose health with every full cycle charge. I don't believe anyone was implying you can't judge when your battery loses charge, regardless of the time of day.

The bottom line is this is a user to user only forum. Apple isn't here nor do they read here for user feedback. Getting annoyed with your fellow users for giving you advice we know is good advice is a waste of time. If you feel there is something wrong with either your phone or the most recent update, take it up with Apple. I can tell you that every device we own is updated to the most current release and yet not one of them is experiencing any battery drain. None whatsoever.

You can visit any Apple Store Genius bar if you want help from Apple directly.

amirtrx wrote:

I got the same issue after updating iPhone SE3. It has been ongoing for over two weeks. It warms up and drains the battery like crazy. Just before that, it lasted 2 to 3 days with normal use. What kind of process could it be after two weeks!? I tried every possible way to fix the issue, but I had no luck. I took the phone to the Apple Store with 83% battery; they replaced it with a new 100% battery and reset the phone completely. That was an absolute waste of money, about 105 CAD, and Apple clearly takes no responsibility for this mess. This is really frustrating and disappointing.

both my SE3s are working as normal. Ie a good days battery life with moderate use.

Your phone has a problem, either some component failed or an app needs updating or removing.

2-3 days is abnormal, some might day unbelievable.

I have iphone 16. 10 month old, batery on 96%.

i update 25.5.2 10 days ago(at least) and since then my batery last 50% less the before update.

now 6 hour of using, max with 100 charge.

before update it went easily 11-12 hours.

the way i use it is pretty much same all the time

lowela208 wrote:

worst update, the previous one before that update was fine . Then when I installed that my Apple Music started to crash, the repeat button is not working and sometimes the volume won't work even the music is playing . Next is the Google Chrome browser or even the Google engine, when I type and I want to edit or delete a single letter the x button won't work, even the microphone or camera . so I had to use the delete on my keyboard, so many issues. sucks, wost in the worst . that was you guys did before. always crashing things

1. Off topic
2. Get your phone repaired or replaced. It may have busted during update.

What apps are consuming the most of iPhone’s daily battery capacity?

I feel the same way with iPhone 16 Pro. My battery was at 41% just now before I did a force restart. Will see if that helps any