User level: Level 1 (19 points)I have an iPhone 16 Pro and have installed iOS 27 because I needed a new watch. Since then my battery on my phone will barely last a day. Is this a known issue or are there any settings I can turn off to mitigate some of this?
thank you.
Posted on Oct 21, 2026 5:23 PM
User level: Level 1 (19 points)Oct 26, 2026 4:59 AM in response to Todd Thomas
Ok I think I might have figured part of it out. After watching the insights I noticed Chrome was doing a LOT in the background several times. I turned off background app refresh and that made a huge difference. I also noticed a couple of other apps doing the same but to a smaller extent and turned those off.
I can now get to bed time with over 40% battery left.
Thank you
User level: Level 10 (105,996 points)Oct 21, 2026 6:15 PM in response to Todd Thomas
When did you install the update? You should expect to experience battery drain, increased heat, and some UI lag while the background processes continue to index the new files in the background. This is detailed in the link provided by sberman in the Support Article titled About Apple Software Updates.
Typically this continues for about 5-7 days and then your performance will return to normal. To make sure those processes are allowed to finish quicker, make sure you are charging your phone all night, every night and it is connected to WiFi.
If it has been longer than those 7 days, then let us know as we can continue on to the next step to see the apps that are consuming your battery.
User level: Level 10 (280,982 points)Oct 21, 2026 5:41 PM in response to Todd Thomas
See especially “If battery life is less than expected after an update“ here.
If the battery in your iPhone or iPad drains too quickly - Apple Support
And for the future, consider updating iOS as soon as Apple releases updates.
About Apple software updates - Apple Support
User level: Level 1 (19 points)Oct 21, 2026 9:03 PM in response to Mac Jim ID
Installed on 09/28. I also installed it on my 9th gen iPad and it seems to be sucking the battery down there also.
Originally posted at discussions.apple.com/thread/256380554