iPhone 16 Pro Max battery issue after updating to iOS 18.6

I've just updated my iPhone to iOS 18.6 late July. It's been about 1 or more week since then, and I noticed that my battery is still draining faster than on 18.5. I know that usually after an update you need a few days for indexing and stuff, but draining 1% every 5 minutes on wi-fi and light usage is very concerning for me. I tried a hard restart when I noticed this draining issue, but the it still persists. For reference, usually I will end my work day with about 40% left, but after updating it consistently reached 30% or less at the end of the day. Is this really normal behavior after update? What can I do to improve my battery?


[Edited by Moderator]

iPhone 16 Pro Max, iOS 18

Posted on Aug 6, 2025 9:14 AM

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3 replies

Aug 6, 2025 12:21 PM in response to Aurellius126

Aurellius126 wrote:

I've just updated my iPhone to iOS 18.6 late July. It's been about 1 or more week since then, and I noticed that my battery is still draining faster than on 18.5

Is this really normal behavior after update? What can I do to improve my battery?


Put your iPhone in diagnostics mode - identify potential hardware and software issues

How to put your iPhone in diagnostics mode - Apple Support



Follow the 3R 's- if a restart does not solve your problem proceed


Have you shutdown & restarted the iPhone ie power off/on...

Restart your iPhone - Apple Support


Reset or a Force Restart,

Force restart iPhone - Apple Support


Restore from backup, restore as new device.

Restore your iPhone, iPad, or iPod to factory settings using a computer - Apple Support


Aug 6, 2025 12:24 PM in response to Aurellius126

Have you tried restarting your iPhone?


What apps have you been using? Meta apps (Facebook, Insta, WhatsApp, etc) use excessive amounts of energy. Recently so have Words with Friends and the Amazon app recently.


However the difference between 40% and 30% can easily be to normal usage variability. If it didn’t make it through the day without charging I would be concerned, but what you report is a normal range.

Aug 10, 2025 6:53 PM in response to Aurellius126

Hey sir ihave the same problem ihave my iphone 16 pro max that was on ios 18.3.1 it was perfect from battery side for my usage i only charged it to 80% it was more than perfect for me it lasted whole day so ihave to charge it once in day around 1pm until the next day at the same time after I updated to 18.6 the performance of the got alot better and smoother but my battery got very very worst now ihave to charge the phone twice a days and i meant it the update sucks battery wise

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iPhone 16 Pro Max battery issue after updating to iOS 18.6

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