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Well I installed it, let it do its thing during the night on the charger, been tinkering whole day, took lots of photos etc and battery seems just like on 16, which is pretty good for a prerelease software.
 
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Might be a bit too early but looks like battery drain on my iPhone 13 Pro Max with iOS 17 RC is NOT fixed at all.
I unplugged my phone at 6am, it's 2 pm and I'm left with 47% with just 2h and 20min SOT.
And 1h of SOT is just Safari.
I'll wait few days but I'm pretty sure nothing will change and if that's the case then that's quite pathetic they'll release it to public.
The whole OS works fine, it's smooth and so on but that battery drain is unacceptable for me with Pro Max phone on a RC release.
Same issue here on regular 13 Pro. Battery life has been as poor as on Beta 8 so far and I'm not using my phone for some extremely battery draining stuff. Only messaging, emails, web-browsing.
 
I’d say I got about 10 hours SOT yesterday.
Wow which phone is that?

Here on my iPhone 14 pro Max it still sucks with the developer RC.

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My battery was poor on my 14 pm on beta 8 and the rc, reset my settings, battery was still poor and my phone was super hot. I reset my network settings and went back to iOS 16.6 battery life. No more overheating and my battery life drastically increased. Happy now.
 
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4 days later after updating to RC, I can surely say that battery life has imporved. It's still not as good as it was on iOS 16.6, but I'm sure that with future updates it will stabilize. (iPhone 13 Pro)
 
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After a year of disappointing battery life, I’ve never had as good of battery life on my 14PM as I have the iOS 17 RC release. So happy to see it. I hope it’s only better on my 15 Pro Max!
 
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Maybe it helps: Last year with iOS 16 I had huge battery problems. Anytime in airplanemode without WiFi I noticed, that the battery life was very good. By chance I discovered, that in the files App from Apple it was "Syncing..." all the time (you can see that on the bottom in the app). But anything was synced. So I deinstalled the App right on the Homescreen and reinstalled it from the Appstore. This solved my battery drain issue. Problem was: I wasn't able to see, that the files app used that much battery in the battery settings of the iPhone. It was like a "phantom usage". And of course - if it's not the files app - maybe there are other apps using the battery that much without showing it in the battery settings.
 
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Maybe it helps: Last year with iOS 16 I had huge battery problems. Anytime in airplanemode without WiFi I noticed, that the battery life was very good. By chance I discovered, that in the files App from Apple it was "Syncing..." all the time (you can see that on the bottom in the app). But anything was synced. So I deinstalled the App right on the Homescreen and reinstalled it from the Appstore. This solved my battery drain issue. Problem was: I wasn't able to see, that the files app used that much battery in the battery settings of the iPhone. It was like a "phantom usage". And of course - if it's not the files app - maybe there are other apps using the battery that much without showing it in the battery settings.
Do you mean “Files” app ??
 
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Bigger batteries in the 15’s will help a lot with battery issues I suspect.
That's what I think, too. I think it's kind of admitting these iOS versions just use more battery and that's why bigger batteries and a more efficient chip don't translate into a gain in battery life. The battery iPhone 13 Pro Max was getting on iOS 15 hasn't been matched yet. The 14 series wasn't worse on paper but iOS 16 in real usage made them last less than the 13 series.
 
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Well… my iPhone 13 Pro Max can’t relate. 20% left and it’s not even 6h SOT.
It’s been like that since beta 7 and I don’t do anything resource heavy like playing games or something.
So I actually do hope RC will change whatever they’re doing with the last 2 beta
13 Pro user here. I updated to the RC a week ago today and I’m consistently getting around 5 hours of usage when I could get 7-7.5 on iOS 16. Quite a massive drop that hasn’t gone away, like you. Shame.
 

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OMG what is up with the battery life!!! iPhone XS Max, new'ish original battery (at 92% capacity). This morning it went from 100% battery to 90% in like 8 minutes almost just holding my phone. I put it on charge and it wouldnt go up and got stuck at 90% charge. Never had such bad battery drain!
 
after charging my iPhone 14 pro before bed (10pm last night) it was still on 100% this morning, pretty impressed, hate iOS 17 though its like a cartoon show. Battery still at 100% capacity launch day model.
 
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