iPhone battery draining after iOS 18 Update

Found this on another thread How to Stop Battery Draining on iPhone After a Recent IOS Update and it's been a game changer, battery which was reducing 20 to 30% in 1 hour of basic usage now reduces only 15%. I will update you on which adjustment helped alot as I am currently testing on it as I don't want to disable some features so will update soon here.

After updating to ios 18, my iPhone 15 pro max draining battery drastically.

14 Pro Max lasted about a day and a half before I installed 18.

Now I can’t even get a day.

Wish Apple would give us a downgrade option till they fix this.

after updating to ios 18 my iphone 15 battery is draining very fast and have to charge like 3 times a day. And even just after the update restart the battery health reduced from 100 to 90%.

After updating to ios 18, my iPhone 13 draining battery drastically.

Same. Phone is not keeping a charge, draining 3 times a day and overheating - which then prevents charging. Really wish there was a way to reverse the update. I heel checkinh for an update psycho but no luck so far.

I contacted Apple support as I'm having the same issue with iOS 18 update with my iPhone 15 Pro Max (which has a brand new Apple certified battery with 3 cycle count). I was told that Apple knows about the issue, is working on it and will fix it in the coming iOS 18 (18.0.1 or 18.1….) update.

They are always doing that after a new model is to be realesed.

This is my last iPhone I’m switching to Samsung after this. I’m feed up, I’ve had all the models since iPhone 7 and same ****.

byeee

My battery life went from 84% to 77% just after updating ios18

I couldn’t agree more! I was so excited for all the new things to come from this update, but I can’t even do the basic things on my phone before it already being at 20 percent in like 5 hours. I constantly have to charge it!! Best and worst update I swear.

Iphone 13 drain very quickly i have 15% drains in of 20 minutes use. Battery health is at 85% before update it was 89%.

the heck it this.

It’s the photos app. I’ve had things like background app refresh, dictation and location turned off for years. I have about five (non Apple) apps installed (no social media or entertainment type) and I use my iPhone 15 Pro primarily for talk and text which never accounts for more than 5% of my battery use, even on a heavy use day. I went from holding a two day charge to charging twice a day immediately after iOS 18. I noticed in Battery Heath that Photos was using 32% of my battery in the background which was alarming because I don’t use Photos in that capacity, and for the fact that I have background refresh disabled. My solution was to turn cellular data off for Photos entirely. (Settings > Apps> Photos > Cellular Data> toggle off) It’s been about a week and my battery is holding almost the same charge it did pre-update. I hope this helps!

Apple has essentially overhauled the utility app into their own version of social media, riddled with unnecessary AI and it’s working as such. Imagine it as uploading 5,000+ photos and videos to Instagram all at the same time. As long as you connect to WiFi periodically, your photo’s will continue to sync to iCloud. I don’t use the app much, but I can’t find any reason to have Photos running on cellular.

Side note: I do not connect my iPhone to WiFi on a regular basis. If you are constantly connected to WiFi, this fix likely won’t work for you as the app will continue to run in the background via WiFi and there is currently no way to disable this function (hence the issue).

Give it a day or so and then see if things improve on their own. Your iPhone is doing a lot of background work after an iOS upgrade, particularly such a significant one as this, and that can take quite a bit of battery power to complete. Check again tomorrow or perhaps Thursday and see what the situation is.

Regards.

Yes, doing frequent charging trips since the update. Not really happy before, not now. Its bit frustrating, its a new phone

Here is what Apple says on it's battery support article about iPhone battery drains after updates.

If you notice that your battery life has decreased after updating your iPhone, wait a few days and then check again.

Even though you can use your iPhone immediately after an update, certain tasks related to the update continue in the background and might affect battery life and thermal performance.