15 Pro Max. Numerous times now I’ve had my phone plugged in and battery is declining at a decent pace. Only thing I’m doing on my phone is watching YouTube videos and surfing safari a bit.
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iOS 27 battery life thread.
- Thread starter goldmac2006
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Well actually my phone keeps getting warm/hot ever since installing it almost 2 days ago. I also still see the indexing message in settings so I’m gonna give it a few more days.
fleabttn
macrumors newbie
be it the indexing or the ai, the battery life isn’t great and the phone is warm. i’ll see how it is in a week.
I’m noticing really slow charging. So slow at times that my battery is declining even though it’s plugged in. For example I am charging right now (140 watt charger and 250 watt cord), my battery is at 40% and I’m pulling 1-5 watts at the moment. And it’s been like that for last 15 minutes.
Battery usage is more on iOS 27, But that's to be expected on the first beta. I can literally what the voltage drop if I have multiple apps opened. I just close them down while I watch Netflix or something. Then the battery drainage isn't so bad. I like the new usage history so I can monitor my usage daily.
makoru
macrumors regular
It's about the same I'm having right now with my 16 pro max on iOS 26.5. How much screen time do you have?
Honestly my phone keeps getting warm and it’s still indexing but I will wait a few more days
mikelets456
macrumors 6502a
Kind of surprised that my battery life is slightly worse than iOS 26…my phone does get warm and runs a lot smoother and very few glitches. Maybe because of the indexing and new Siri?
Either way, it’s a stable build and better battery life will come soon.
Either way, it’s a stable build and better battery life will come soon.
fleabttn
macrumors newbie
17Pro. Indexing done, and battery life seems on par with iOS26... but yesterday I activated the new expressive voices, and things seem to be draining faster. Could be related, maybe not. (These obviously do take a bit more memory and are quite buggy... using them while using wireless CarPlay causes lots of issues.)
Well actually it’s not a bug it can take a week to index. It’s been 5 days now I would suggest keep your phone plugged in and on WiFi for as long as possible. That should help the indexing go faster.
Surprised? Battery life is usually terrible on betas, particular developer betas, particularly the first ones. The thing that should surprise you is that it has very few glitches. (But yes, it is quite stable for a b1 and smoother in places than 26.)
Parowdy
macrumors 68000
Time again to scold Apple for their shtification of the battery settings in iOS 26 and them not addressing it with 27.
With 26 it seemed like they wanted to hide how terrible the battery life is by removing hourly usage info alongside battery drain, because everything drained the battery, but presenting it differently and comparing your usage to the day before shifted users perception, at least it was supposed to.
The fact that it’s still the same doesn’t fill me with confidence.
With 26 it seemed like they wanted to hide how terrible the battery life is by removing hourly usage info alongside battery drain, because everything drained the battery, but presenting it differently and comparing your usage to the day before shifted users perception, at least it was supposed to.
The fact that it’s still the same doesn’t fill me with confidence.
FeliApple
macrumors 601
Completely agree, they killed battery life reporting, and it had to be deliberate.
But I warned about it during the beta cycle last year as soon as I saw what they’d done: Apple sticks with these things for years on end. They aren’t changing it anytime soon.
I’m running iOS 18 or below everywhere so I still know how much battery life I’m getting, but yes, the new system disallows that. Utter garbage.
Last night I left my phone (iPhone 17) uncharged at about 65% battery. When I picked it up 8 hours later, it was at 43%. That's excessive compared to iOS 26. It must be the indexing process that's using so much power.
makoru
macrumors regular
Unfortunately, and with the arrival of more demanding interfaces (such as 'Liquid Glass' in iOS 26) and constant AI features, the operating system consumes more power at a baseline level. If Apple were to clearly show that a large portion of the drain comes from elements of the operating system itself, it would be an admission that their new features have a high energy cost, which contradicts their 'efficiency' marketing.
How are people getting better batter life than 26.5.1? My Air's batter barely lasts 12 hrs. Granted I'm on the phone probably 6 hrs of that day (constantly messaging using Messages and Voalte)
Any time I use Siri AI the CPU lights up to 70-80% and the phone gets hot for several minutes and drains probably 5% in that instance
Any time I use Siri AI the CPU lights up to 70-80% and the phone gets hot for several minutes and drains probably 5% in that instance
FeliApple
macrumors 601
Yes, some people have said this, and I agree that iOS 26 worsens battery life, but…
This has always been the case. iOS updates have worsened battery life severely if the device was old enough since 64-bit devices debuted. If Apple wanted to obscure battery life, why now? They could’ve done this ages ago.
Now determining SOT is practically impossible though, this system is garbage.
Reverend Benny
macrumors 68000
Sounds good, have the M1 Pro and looking forward trying iPadOS27.