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Did you check Settings>Battery to see if there are any activities that can explain the drain? Normally, after a setup, there may be other background activities from backup like iCloud etc may continue to run to resync any missing content.

It will eventually subside. Just use it as is and charge it when it’s low and possibly some services will finish to run when connected to power.
Thank you
 
I have the identical experience. I’ve restarted a few times and it dropped three percent at a time. It doesn’t give me much confidence either. I’m on a 13 Pro 128 GB
Has it gotten any better for you?
 
Sometimes a reboot can help. This morning I was listening to music and my phone was warm and the battery was dropping. I decided to reboot the device and after the the drain completely stopped and phone remained cooled afterwards.
 
Sometimes a reboot can help. This morning I was listening to music and my phone was warm and the battery was dropping. I decided to reboot the device and after the the drain completely stopped and phone remained cooled afterwards.
Almost every reboot causes me to lose 3%. Verified by Apple Genius.
 
Is anyones else experiencing this? I realize it’s normal and hopefully will correct but I’ve never experienced this before.
This forum in particular was causing mine to get super hot. I think there’s a glitched ad, because turning on Adblock gets rid of the heat by the volume buttons.
 
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Much worse. I just left the Apple store. Going to replace the unit when they have a new one. I’m down to 64% today over the last 4 hours. Screen on time is only 1 hr 38 min.
What did apple tell you?
 
Did you check Settings>Battery to see if there are any activities that can explain the drain? Normally, after a setup, there may be other background activities from backup like iCloud etc may continue to run to resync any missing content.

It will eventually subside. Just use it as is and charge it when it’s low and possibly some services will finish to run when connected to power.
This is exactly what I was going to mention. The severe drain that I had once on XS Max in July 2020 (Apple Music..although I never used it), few times this year with iPhone 12 Pro Max was due to apps running constantly in the back ground.

Mail.app for example ran non stop, Dropbox, Google Drive, also my home alarm system app did this. just draining daily battery life
"Find My..." app was running overnight for me (seemed to run 1min per hour), but no drain.

3rd party apps that seem to just constantly run, I'd delete them...reinstall and it would do the trick.
The Mail App, close it. I did a hard reset...that seemed to solve that problem.

Go to SETTINGS > Battery. Look down to see the chart, see what apps may be running in the background constantly.
 
I would look at this also under settings. Especially this "Privacy" part in the ios15. When I get a new phone, I always go deep into these settings and just turn them off.

Not only for privacy reasons, but these also may run in the background...settings you really don't need draining battery as well.

Settings - Location Services/Privacy

Full video tweaking other iOS 15 settings
 
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This is exactly what I was going to mention. The severe drain that I had once on XS Max in July 2020 (Apple Music..although I never used it), few times this year with iPhone 12 Pro Max was due to apps running constantly in the back ground.

Mail.app for example ran non stop, Dropbox, Google Drive, also my home alarm system app did this. just draining daily battery life
"Find My..." app was running overnight for me (seemed to run 1min per hour), but no drain.

3rd party apps that seem to just constantly run, I'd delete them...reinstall and it would do the trick.
The Mail App, close it. I did a hard reset...that seemed to solve that problem.

Go to SETTINGS > Battery. Look down to see the chart, see what apps may be running in the background constantly.
Thank you for the suggestion. No rogue apps here. Drain is on the same course whether I restore from backup or use as new. I can watch the percentage drop like a waterfall. Either iOS 15.0 has an issue and an update will fix it, or my phone is borked.
 
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My iPhone 13 pro max loses about 5% battery on a reboot, e.g. from 98 to 93%

Subsequent reboots don’t seem to lose any battery, quite weird
 
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first day with a fully charged battery. Around 8 hours of screen on time and have 36% left
 
Thank you for the suggestion. No rogue apps here. Drain is on the same course whether I restore from backup or use as new. I can watch the percentage drop like a waterfall. Either iOS 15.0 has an issue and an update will fix it, or my phone is borked.
Try turning off 120hz and see what it does.
 
Thank you for the explanation! This is my first new phone in a few years so I was concerned but it’s comforting to know it’s normal and you have experienced it! Hoping this phone will last me a good few years as well!
yea my Pro Max was draining today but it was restoring in the morning.
 
Is anyones else experiencing this? I realize it’s normal and hopefully will correct but I’ve never experienced this before.
Yes.
There is also picture scanning in the background running for people’s faces which is battery consuming
 
This forum in particular was causing mine to get super hot. I think there’s a glitched ad, because turning on Adblock gets rid of the heat by the volume buttons.
This forum has been notorious for that. Every iPhone I’ve owned has gotten hot simply by scrolling this forum. It’s like Apple programs in an over heating function, so people don’t come here and bad mouth them.
 
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I don’t see any difference in battery with my now 13 pro compared to my iPhone 12 that was a 89% of battery health…
 
I don’t see any difference in battery with my now 13 pro compared to my iPhone 12 that was a 89% of battery health…
For me, it's a massive difference so far. I was down to an abysmal 83% health in 9 months 30 days on 12 Pro Max with horrific daily drain, or just losing 10-15% average sitting idle overnight off charger.

Got the max refund for that dud Friday night, trade in. But even when that thing was at 89% health back in early May the drain was horrible. (Drain started way back in Feb.) Just recall taking video of an incoming t-storm...losing 20-25% battery in 10, 15 min., pathetic.

I know I'm only on day 2, just hope the battery in this 13PM is far more stable compared to the 12PM
 
My phone is experiencing battery drop too. I think it’s safari causing the phone to get extremely warm. It’s when I am browsing this forum that the battery is dropping fast.
 
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