Ios 15.1 battery drain

I had same problem with my iPhone 12 Pro Max after upgrading to iOS 15.1. After troubleshooting with online support and then at the genus bar, we decided to perform a device reset but kept the data on the device. Since then I’ve restored my phone’s normal battery life of practically a full days use like I had before. Hope that helps someone else facing this issue.

Settings>General>Transfer or Reset Phone>Reset>Reset All Settings

Take this post in context with what I have posted in the past 24-36 hours, as this is a continuation of those posts.

I have given feedback a few times, once for iPhone and a few for iPad which had even worse drain than the iPhone. If I didn't have a mostly-good solution right now I would elevate to AppleCare at this point. In my case I had to do the following for both iPhone and iPad on iOS 15.1 or higher, and I have posted my findings and tests over the past couple of weeks in the order that I tried them:

(1) removed Apple News from widgets on Home Screen as it was using up a large amount of battery as seen in "Settings > Battery" even when News was not open and background refresh was turned off.

(2) turned off background app refresh and push mail.

(3) reset network settings.

(4) don't pair my iPhone or iPad to a Macintosh after resetting network settings.

The first 3 things only helped for a day or so, and then battery drain came back. I think that was because around that same time the battery drain would always return because I would have re-paired my iDevice to my iMac for syncing and backup via wifi. I think that "pairing" and continuously being seen in the iMac Finder via wifi is likely what really broke my battery life.

So, I think the next step will be to pair one of my devices to my iMac, but TURN OFF WIFI connection, so I have to connect wired-only when I sync or backup and then eject my iDevice when I am done. I suspect it was the continuous wireless connection to my iMac that was causing battery drain in the background that could not be attributed to any one app. iOS 14.8 and older didn't drain the battery like this. if battery life stays good I will next try to turn Background App refresh and push mail again.

Apple News widget was still definitely a culprit to some degree, draining battery a lot in the background; but whenever I would reset network settings the process would also UNPAIR my iPhone and iPad from my iMac. And I think that unpairing was actually the main fix to the battery drain. It was a process of elimination.

Right now my Phone is at 84% FIVE hours after unplugging from the charger. I have used it for 2hr 16 minutes "screen on" during that time, and have not needed low power mode yet today. Battery life seems fixed, and the only thing different with "reset network settings" this time is that I have NOT paired it with my iMac this time.

My iPad is still at 66% after unplugging from the charger at 2:45AM on Saturday (yesterday). So I went from 20 hours of standby time before having a dead battery to now having only 34% battery drain in 38 hours. Standby time has climbed from 20 hours to about 4.5 days. And I do have 5 minutes "screen on" with iPad today. Since I unplugged the iPad 38 hours ago, I have had 40 minutes of "Screen On" use and 12 minutes "Screen off" use, so not actually all on "standby" which is even better. I have had my iPad screen on for an additional 5 minutes while typing this last paragraph, and it's still at 66%, whereas before I would have dropped 1-2% already with use.

Anytime an iOS update messes up battery it can be the OS draining it or a specific app or two.

So to troubleshoot I always turn off push mail and fetch mail, turn off background app refresh, and sometimes turn off Home Screen widgets. Sometimes if have to turn off a lot of location services, and sometimes I have to turn off Wi-Fi and Bluetooth.

Then I see if it’s better, and if better then I start turning things back on until it breaks again.

In the case of Apple News widget, apple news was using up a high % of battery in the background even with background app refresh turned off. It took me a couple of days to realize I still had the widget loaded. That was only causing about 1/3 of the excessive battery drain.

But reset network settings seems to have fixed it for me on 15.1.1 on iPhone 13 Pro Max and 15.1 on iPad mini 6. So I won’t go to 15.2 yet because I haven’t seen anyone who has the drain with 15.2 get it fixed by resetting network settings. It could be a new problem I just can’t deal with.

Can't edit to add this - from yesterday I mentioned things that I did that didn't help, and I have not reversed those settings back to normal yet. I plan to add one of the following iOS features back per day, to see what impact they have on battery life. Those things I changedare in my big post, and I note them again here:

Turned off background app refresh didn't help.

Turned off location services for most apps didn't help.

Turned off push for mail, and changing it to fetch only on power with wifi didn't help.

Reset network settings didn't help.

LOW POWER MODE DIDN'T HELP.

Turned off Apple News Widget on the far left home screen - fixed it so far.

Since I turned off the Apple News Widget at 9:14 AM, when I unplugged my devices (it's 8:45 PM now and almost 12 hours), my battery drain is dramatically better.

(1) I haven't used my iPad Mini 6 and battery drain is negligible so that I'm at 95% charge. Yesterday it would be below 20% by this time of day, even a week after the update to 15.1 when spotlight was done indexing.

(2) On my 11 Pro Max I'm still at 70% charge, after unplugging almost 12 hours ago, and using it for the past 9 hours. Yesterday, before I turned off Apple news widget, I'd be completely out of juice by this time of day.

Again, I didn't use my phone the first 3 hours unplugged today, as a test, and it stayed at 100% during that time. But yesterday it was down to 80% in just 3 hours of standby. I've used my 11 Pro Max normally for about 9 hours today (without touching my iPad) and I'm only using up about 3% battery per hour of use. The previous few days it used to be draining about 7% per hour, even in standby and low power mode, i.e. without touching the device.

I'll be awake for another 5-6 hours, and if this trend continues I should be able to start testing by turning other iOS features back on, like push mail for iCloud and Hotmail, then maybe the next day turn background app refresh back on for a few apps that could benefit.

12/5/21

My response is to "Suppose" who posted his/her response above on 12/1/21 regarding the massive battery drain iPhones have

after updating to IOS 15.1.  I have one word for you Suppose--GENIUS!  I hope the other readers on this forum will have the patience to work through the previous seven pages and reach your response here on page 8 because your response

WORKS!  From reading other people's responses on this matter, I understand Apple engineers don't read forums but do

read the Apple feedback webpage.  Well, they should read the forums also because Suppose has the solution to this

problem.

I also have an iPhone XR. Prior to my updating to IOS 15.1, I would get anywhere from 3 (heavy days usage) to 5-6 (lighter days usage) between battery charge.  I've had my phone for 1 year and 4 months.  At the one-year mark,  my battery health was 99% and currently still is, so my battery is in very good health and functioning optimally.  After upgrading to IOS 15.1, I was lucky if I squeaked out 2 days before needing to charge my battery.  I even tried not using my phone after fully charging it, and it still only gave me maybe 2 days before I needed to charge it again (??).  I went through all my settings to confirm they were still where I set them and that I hadn't accidentally turned on some function that was sapping battery charge or whether

the IOS update turned on a setting I previously had turned off and that is why my battery was going down very, very fast. 

As a side note, you should go through your settings after each IOS update because I have found Apple assumes you want some new function turned on by default and also turns back on something you have previously turned off.

Anyway, I was really frustrated with the significant drop in battery charge so quickly after updating to IOS 15.1 which was not my experience with other IOS updates prior to this 15.1 update.  I began searching the web to see if anyone else was experiencing significant battery drain after updating to IOS 15.1.  MANY people are experiencing this so we on

this forum are definitely not alone, and I join others on this forum hoping future IOS updates will formally correct this problem now and so it doesn't happen again in the future so we don't have to search for a "work around" because of Apple's error. 

My search brought me to this forum, and I read all 8 pages of users' troubleshooting and "work around" ideas.  Then I came to page 8 and Suppose's response.  I tried it and it WORKED! Let me explain. 

I reset my network settings (yes, this means you'll have to reenter your passwords for the WiFi networks you use).  While Suppose turned his/her phone off for 30 seconds, I turned mine off for ten minutes (nothing magical about ten minutes...I just wanted to do it).  I fully charged my phone.....and then I waited. Seventeen hours after I had charged my phone, I had 100% charge remaining; 24 hours after I had charged my phone, I had 96% charge remaining; and 36 hours after I had charged my phone I had 91% charge remaining.  So, I was one and one-half days past charging up my battery and I still had quite a bit of battery charge left--unlike as I described above barely getting maybe two days (just a half day longer than my test example) before my battery dropped to 20%--21%.  Suppose's recommendation resolved my severe battery drain and returned by battery discharge level to the level I had in the past.  I'll use this method if I experience a similar situation after future updates.  By the way, from some articles I've read on the web, IOS 15.2 might be coming out within the next couple of weeks (either

sometime during the week of 12/5/21 or sometime during the week of 12/12/21).  Here's hoping they have

addressed this issue in it.

Finally, I use my phone largely for phone calls, text messages, and voice memos.  I also use it as needed for photos, adding/deleting contacts, and retrieving voicemails.  I'm sure many on this forum use their phones far more extensively and for more purposes than I do.  However, I just wanted to add that the methods you read on the web from Apple and other reliable sources for ways to reduce battery drain (under normal use and not because of a rogue IOS update version) and extend battery health and life really do work....I've seen the positive results on my phone.  So if you don't always need to have background app refresh, fetch/push, location, some notifications, multiple apps going at the same time, display settings, and

other apps always on and/or always at the max settings, any function you can reduce the use of or turn off when not using will help your battery last longer between charges and extend the lifespan of your battery.  Of course, you all know what your needs are.  I just wanted to share what methods of reducing normal battery drain and extending battery life have worked for me in case they may be of use and help to you.

Thanks, again, Suppose for your help!

Thanks @k_p95, I'm glad you understand that I was just trying to get some specific info that might help us understand why your battery is not draining while ours do.

Background info to sum up my posts for the past 2 weeks:  Immediately after iOS 15.1 I was having battery drain @ 5-7% per hour & "Settings > Battery" was showing Apple News using a ton of battery when it wasn't running. Turning off background app refresh did not help. I tracked that down to the Apple News Widget running on the home page. Removed the widget and Apple News was no longer using 20-30% of my battery. 

But I still needed to engage low power mode to get through the day with my IPhone 13 Pro Max and iPad mini 6. So I turned off Push Mail, no help. But "Reset Network Settings" did have a big improvement.

Every time I did a "reset network settings" it helped for a day or two, but then my battery drain returned. Whenever I would "reset network settings", I'd have to rename my iPhone or iPad, connect to my wifi and turn on wifi calling, and then restore the connection between those devices and my iMac by plugging in and choosing to "trust" the iMac via the dialog box on the iPad or iPhone screen.

Then I realized that it was only AFTER I trusted my iMac connection and told it to "show this iPad when connected with wifi" that I saw the 4-5%/hr drain return.

I reset network settings again before going to bed late at 2:45 AM on Saturday Dec 11th, and I decided to NOT pair/trust my iPad and iPhone to connect wirelessly to my iMac, so I could see if not restoring that wireless "network connection" would help battery life. YEP! By not pairing my iPad to my iMac, iPad was no longer draining 4-5% per hour in standby.

I ran a standby battery life test on the iPad WITHOUT low power mode until I was down to 10% charge - I didn't use the iPad much during the first 2 days, and then I used it for almost 5 hours straight at the end during the last 50% of battery charge. Here is what I found (I had screen shots to help me with the timeline):

• The iPad battery was at 100% at 2:45AM Saturday Nov 11th when I unplugged it, and was still 100% when I woke up at 10:20AM that morning, almost 8 hours later! Previously the battery would have drained to 60-70% during that 8 hours.
• By 6:45PM Nov 11th I had used it for about an hour and 15 minutes during the day and the battery was down to 85%.
• By 11AM Sunday Dec 12th the battery was down to 70% with about 1hr 45 minutes of total use in the most recent 24 hour period before that (some of the battery usage reports to follow will overlap this time period).
• By 6:34PM Sunday Dec 12th the battery was down to 62% with about 45 minutes of use during the previous 24 hours
• By 1:15AM Sunday Dec 12th, almost ready for bed, the battery was still at 57%, with about 23 minutes of use over 24 hours.
• Around 11AM Monday Dec 13th the battery was at 50%, then I used it almost 40 minutes straight & it dropped to 45%.
• By 1:41PM Monday Dec 13th I had continued to use it, reaching 2hr 20 minutes of use, and battery had dropped to 29%
• By 2:56PM Monday Dec 13th I had continued to use it, reaching 3hr 30 min of use, and battery had dropped to 14%
• By 4:28PM Monday Dec 13th I had continued to use it, reaching 4hr 30 minutes of use today, and battery dropped to 10% and low power mode was engaged.
• by 4:52PM Monday Dec 13th I had continued to use it, reaching 4hr 50 minutes of use today when it hit 2%. I uploaded my 10 screenshots that were pending and it dropped to 1% and I plugged it into iMac about 5PM, I "trusted" the computer and I turned off "show this iPad when connected with wifi".

I had used it for about 1.5 hours over the previous 48 hours, and another 4hr 50 min today, all while not being plugged in for a total of 66 hours. I think it averaged out to about 10 hours standby = 1 hour of use. Out of the almost 5 hours of battery usage today, 45% was Safari, 36% was Reddit, 5% was mail, 3% was Messages, 3% YouTube, 2% Settings, 2% FaceTime, 1% Home and Lock, 1% Twitter, 1% Find My, 1% Siri, 1% Photos. Somehow 101%...

• By 8:44PM Monday Dec 13th the battery was full again and I unplugged it from iMac.
• Now at 12:31AM Tuesday the 14th, at 4.25 hours off the charger, I am still at 100%; whereas before "reset network settings" it would have drained down to 80-85% by now.

So, THE FIX = After "reset network settings" when you re-pair/trust my iPad to iMac do not turn on "show this iPad when connected with wifi".

I am not seeing the battery drain anymore, and I believe that turning off "show this iPad when connected with wifi" after upgrading to iOS 15.1 may help others too.

I tested iMazing Mini on the iMac to stay connected to the iPad and iPhone over wifi, and it's not draining the iPad battery at all. I can use iMazing for wireless backups to the iMac.

I will probably upgrade to iOS 15.2 in the next day or two, but I'd like to enjoy my new-found battery life a little longer before 15.2 forks up something else!

...So, THE FIX = After "reset network settings", when you re-pair/trust your iPad/iPhone to your Mac, do NOT turn on "show this iPad/iPhone when connected with wifi" in the Finder.

I am paired/trusted to iMac again, but via wired only, and I'm not seeing the battery drain anymore...

I also tested iMazing Mini on the iMac to stay connected to the iPad and iPhone over wifi, and it's not draining the iPad battery at all. I can use iMazing for wireless backups to the iMac.

My devices are still holding their charge overnight with the above fix, with the iPad only losing 2% charge while I slept. My iPhone has been unplugged for 3 hours and is still at 100% with about 25 minutes of use (15 screen on). Previously the iPad would be down to 60-70% charge after being unplugged overnight, and my iPhone would be down to 85-90% after being unplugged for 3 hours and unused.

I can still sync and backup to Finder using a wired connection, since wifi is no longer causing the battery drain.

I also now have iMazing app running on my iMac and connected wirelessly to both devices in the background via WiFi instead. It is not draining the devices at all, unlike what happened when I had the devices show up in Finder over WiFi. So, I can still do a WiFi backup whenever I want, I'll just use iMazing instead of Finder, until Apple fixes this. If I have to use SideCar, I'll do it wired.

After I upgrade to 15.2, I'll try turning on "show this iPad when connected with WiFi" again, and see if the drain stays away. But that may be a few days away.

If this is a problem with iOS 15.1 and Big Sur 11.6.1 being used together, it will be a bit longer before I upgrade the 2015 iMac to Monterey (maybe when 12.2 is out). I am going to run a backup and then do the new Big Sur 11.6.2 that I just noticed first.

I contacted Apple Support last night and they took me through the expected set of questions, remotely accessed my phone to pull a report, make suggestions on battery life preservation, and provide options for getting a new battery.

He also mentioned that there could be an issue with some apps not playing friendly with MacOS 15.1 and may require updating by the developers in order to reduce battery drain. He noted that there could be some apps not ready for iOS 15.1 which can drive up battery usage behind the scenes. Although he did not specifically point any out, except for the main Facebook app.

Notable Recommendations:

A) Change "Background App Refresh" to Wi-Fi only (or turn off altogether)

B) Turn off Background App Refresh for anything Facebook

C) Turn off Background App Refresh for anything not needing it.

D) Turn location services off or use set apps to "While Using"

E) Swipe Up ... All Apps Not Being used (turns out open apps still run in the background)

F) Update all your apps daily so they will function more efficiently on MacOS 15.1.

It is too early to know if these will help for certain but over the past 12 hours, the battery activity has dropped a little and the Facebook app (a real resource hog) has dropped out of the Number 1 spot for battery usage by app.

Summary: This is definitely a software issue with the responsibility on both App Developers and Apple. Apple can only fix so much because we may have individual apps that can generate insane amounts of battery usage if they don't work as efficiently with an updated operating system. It is a bit of a grey area. And kind of frustrating.

Either way, I am going to test these steps above, make sure all apps are updated, and monitor my Battery Usage by App going forward.

Good luck folks!

Shane

I had a call with L2 Apple support and they've observed the issue and seen just how badly Safari chews up battery. They've now referred this to their engineering group and they're gonna follow up with me. What I've been advised to do is back up my phone prior to their call as the likelihood is they'll ask me to do a ground up install of 15.1 as a brand new install as opposed to the upgrade executable that I daresay everyone applied. I'm not relishing the prospect of having to do essentially factory reset then restore my backup but at least engineering are looking at it. I would encourage everyone else to phone up Apple support so that they realise that this is not a once off user issue and is far more pervasive across different iPhone models/SKUs then hopefully they can release a patch to update this issue.

11mins Safari use from 2hrs 11 mins sreen on time should not equate to 21% battery usage. I've also been advised to use an alternative browser to Safari for the time being until product engineering get back in touch with me. Last night I observed my iPhone heating up (from being cold on standby) with about 10 mins Safari usage

Okay, final update. I am going to bed at 1:26 AM and my 11 Pro Max has been unplugged since 9:14 AM yesterday. That's 16 hours on battery since I disabled the Apple News Home Screen Widget.

(1) I am still at 60% battery. So my drain is fixed with light usage (3.5 hours screen on, 40 minutes screen off). Before this the 11 Pro Max battery would be dead within 12 hours on iOS 15.1, but now I can go two days on one charge again without low power mode again. It even stayed at 100% for the first 3 hours off the charger, until I started to use the phone.

(2) My iPad Mini 6 also had the issue with iOS 15.1, and with 19 minutes screen on and 1.5 hours screen off, while on battery for the past 16 hours, it is still at 92% in standby all day.

Now, tomorrow (today I guess) I will try heavier use with both - like surf the web for an hour, watching a video for an hour in the TV app, watching YouTube app for an hour, and reading a kindle book for an hour, and see how fast it drains. I think they should only drop about 8-10% per hour doing that, and hopefully only 6-7% an hour if I am lucky. With the bug, I was draining 10-15% per hour with heavy use on my 11 Pro Max, and 7% per hour in standby in low power mode.

If so, then I will turn push mail and background app refresh back on, and pretend like this didn't happen.

SOLVED: IOS Battery Drain.

I have iPhone XR. After install of IOS 15.1, I had two problems. First, my battery only lasted about 14-16 hours instead of the previous expectation of 24 or more. Second, unless the battery was at least 80% charged, I was unable to access directions on any of the map apps when I was using LTE. Told I wasn't connected, even though I could get email.

I finally figured out that the GPS system power demand must be exceeding that available on the partially depleted battery. I read through this forum and tried several of the fixes suggested. This one WORKED.

I went Settings-General-Transfer or Reset iPhone-Reset-Reset Network Settings. Powered off. 30 seconds. Powered on. Charged to capacity over night. 9 hours later, the battery icon has barely budged and LTE navigation works on all apps.

I had to go through dozens of posts and tried several fixes. Posting this in hopes that someone else can get this to work for them.

I’ve been advocating to “reset network settings” for a couple of weeks. That and turning off widgets on the Home Screen have been the most help. Before doing that even low power mode was not much help. I was amazed at how excessive the drain was and that it didn’t change for me with low power mode.

So, after doing a RESET NETWORK SETTINGS it would help battery life for a couple of days, and then the drain would come back. This last time that I did it for my iPad Mini 6 was last night. I still have background app refresh off, and push mail turned off while I troubleshoot. (I'll get to my iPhone 13 Pro Max at the end).

This time, after resetting network settings and signing back into my wifi, I did NOT connect it to my computer and "trust" the computer nor let it be found on wifi as I've always done before. I only ever connect to back up, sync, or use sidecar maybe once a week; and I realized that my battery drain doesn't come back for a couple of days until AFTER I connect to my iMac to do a backup or sync, and then it all goes downhill again.

So, I left the iPad unpaired from my iMac, and elected to leave it as a standalone device. I thought maybe that network wifi connection to the iMac was draining the battery when NO apps are running.

IT DEFINITELY HELPED. I left iPad Mini 6 unplugged at 2:45AM today when I went to bed with 100% charge, and woke up this AM 8 hours later at 10:45AM to find that the iPad was still at 100% charge! Normally it would have dropped from 100% to between 60-70% during that 8 hours of unplugged standby time.

By 3PM, 12 hours after coming off the charger it was still at 98% when not using it (dropped to 97% while checking battery use). The battery-level line was pretty flat, and not dropping at a steep rate that you would have expected with heavy use. I used it for about 1.5 hours total over the day, and the battery was down to 82%, with a flat battery-level line when not using it for an hour or two. I just left the screen on for another 15 minutes while typing this, and it dropped to 80%.

But I'm 20 hours out from my last charge, and previously after the iPad OS 15.1 update I would absolutely have a dead battery by this 20 hour mark with it in STANDBY and 0 minutes of use. Here I am now with 1hr 10 minutes screen on, and 28 minutes screen off use, and still at 80% !!!

Prior to reset network settings it would lose between 4-6% per hour, and with over 1.5 hours of use I am averaging 1% per hour drain, but much less than that when not using it. I am not going to plug the iPad into power tonight, to see what my charge level is at tomorrow morning.

As for my iPhone 13 Pro Max, I had last reset network settings about 3-4 days ago and it helped but gradually worsened again, although it did well while reading a book with black background and white text last night. I unplugged iPhone from the charger at 10:11 AM today, but by 3PM it was at 80% charge with only 52 minutes of "screen on" use during those 5 hours. I put it in low power mode at that point and used it for about 1hr 43m "screen on" between 3PM - 7PM where it had dropped from 80% to 60%.

I then reset network settings at 7PM, and 4 hours later (with 30 minutes of "screen on" use) the battery was still at 52% in low power mode. The rate of battery level drop on the iPhone battery graph was fairly steep before vs after "reset network settings" when it went much flatter. The rate of drain prior to the network settings reset was a flat line that would have intersected with a 25% battery level right now, instead of 51% where it sits now.

One thing that I have noticed with my iPhone 13 Pro Max is that when it hits 50% battery it drains slower, and I was able to read a book for 4 hours last night and it only drained from 50% to 25% during that time. So, at 51% now and I expect it will drain even slower tonight than last night.

EDIT - (1) not sure if I should let iPhone 13 Pro Max drain to 0% and shut off on its own to calibrate it, because I've been charging when it hits 20% to avoid harming the battery.

(2) I've noticed that I have optimize battery charging turned on, but I don't think it's working and I have regular bedtime hours. With iPhone on my wireless charger, it just charges slowly to 100% over 4 hours, and then stays at 100% charge for the next 4 hours before I wake up at the same time every day.

@Alancito - I want to be clear that I have posted here previously that I have already reported this to Apple for both iPhone and iPad.

I am not here to complain anymore. I am trying to help the people here that are having this same problem, while we wait for Apple to fix things. So far my solution works, do a reset network settings AND do not pair and trust your iPad or iPhone to your Macintosh.

I have not plugged in my iPad since 2:45 AM on Saturday morning, and 2 1/2 days later my iPad was at 50% when I woke up at 10:30 AM today. The standby time on my iPad has increased from 20 hours up to 4.5 days with about 1 hour of use during the past 2.5 days!

The ONLY thing I’ve done DIFFERENTLY over the last two weeks after resetting network settings each time, is that this time I did NOT plug it into my iMac and NOT ”TRUST” it to Sync or Backup wirelessly.

NEXT STEP OF TESTING - I am going to use my iPad today until the battery runs out. Then I’m going to charge it by plugging it into my iMac and hitting ”trust” to pair them. But I will turn off the ability to wireless sync and back up, before I unplug it. If the battery drain stays away, then I will have narrowed the cause down to simply having the iPad set up and trusted with my iMac to be accessed wirelessly.

I made it through an entire 16 hour day on my iPhone yesterday (10:30AM thru 2:30AM) with four hours of “screen on” use on my iPhone and 60% battery left when I went to bed at 2:30 AM, and did not need low power mode anymore. Prior to this fix not trusting my iMac I could not get through the day without low power mode unless I plugged in for a partial charge.

No, I have not turned background app refresh back on yet because I only had three or four apps out of 100 that I had using this feature. And turning off background app refresh had not improved battery life anyway. I will test that later. And No I have not turned push mail back on, because I was only using push for iCloud mail and had fetch automatically on my other 10 email accounts. Fetch automatically is still on. Besides, turning off push email did not improve battery life either.

The only two things that improved battery life on iOS 15.1 have been disabling Apple News widget on the home screen, and resetting network settings without re-pairing it to my iMac.

Also want to note that I have not force closed any apps on my iPhone 13 pro max, and the same 27 apps are open throughout my iPhone test yesterday, and now.