iPhone battery draining after iOS 18 Update

After updating to 18.1 on iphone 15 pro max, about a year old phone, the battery still drains very quickly relatively to how it was with iOS 17.x

Same here and iPhone 14 Pro Max. Will not work for half a day. Reboots and drops from 65% to lower to 10% battery suddenly.

I just updated my iphone 15 pro to ios18 and my battery is draining very fast! my battery used to last all day… and now i need to charge it once in the middle of the day. what can i do?

In my case FactoryReset helped for three days and then battery drain continues (iOS, 17.6-17.6.1-18-18.1...) still the same.

Iphone 16 pro, and even doesnt last 10 hours a day because of photos app draining battery :(

Thanks, I'll give it a try, I'll try anything, I'm slowly giving up on my iPhone. The phone is sitting on the table doing nothing, yet it loses 5% battery per hour.

iPhone 13 Pro Max, I update it mine and I had it charging all night last night, and I just noticed the battery went down to 42%,, and it feels is charging very slow as well..

I did some reading and based on bad experiences with iOS updates in the past I did not take ios18 i did ios17.7 and seems pretty normal performance and battery life maybe a little worse from 17.6 which is an excellent update. Good battery and good performance! If you can down grade fro ios18 to 17.7 you’ll get good results in my opinion

This is a common complaint after EVERY major update, along with "my phone is hot", just do a search. People don't understand that after an major update, there is a lot of work being done in the background for 12-36 hours, depending on the amount of data stored on your iPhone. Give it time to do it's work and you will see a return to normal. It's not a bug and it is nothing Apple "needs" to fix.

Issues started with iOS 17.5xx and continued with iOS 18. Battery is dying in front on my eyes even if all “hacks” to reduce battery consumption have been applied. Worst of all I had 98% battery health (maximum capacity in my 14 pro max) and almost one month after faulty upgrades max capacity went down to 94%.

Thank you apple…

Shocking! Same here I update two days ago and my batterie is draining hardcore as well! I just bought the new IPhone 16 Pro Max which arrived today ans my IPhone 15 Pro Max is loosing power like crazy now. Batterie Health is down 5% in two days. Has anyone managed a fix here?

I am supposed to sell my IPhone 15 Pro Max. Which now is going to be a time game! Please advise.

What you are saying is generally true, however in my case, it goes way beyond simple background file indexing. My horrific usage of battery is tied directly to the Calendar app. It appears it is stuck in a cycle of trying to synchronize. I finally deleted the app, which solved the problem. Hopefully, after a reinstallation, things will return to normal.

Try turning off apps that run in the background unnecessarily. To do this go to settings>general>Background App Refresh, and turn off anything that doesn’t need to run in the background. For example, a social media app, home manager app (Like apple HomeKit or Google Home shouldn’t be running in the background, but an app like Bose connect, Siri, An antivirus app, adblocker, weather app like the weather channel, or smart news needs to run in the background in order for it to work properly. In addition to this, you can also disable any ad tracking features by opting out of them in privacy and security. The last step is to disable unnecessary notifications. You can do this by going to settings>Notifcations, and turn off anything that doesn’t need to send notifications. (Again, same deal with background app refresh, anything like an antivirus app, weather app, or social media app doesn’t need to send notifications, but the phone app, FaceTime, and news or FaceTime and Apple Tracking notifications do so keep those enabled.

I hope this helps.

Thanks, Caleb

Same to me, once I upgrade IOS 18, my phone battery drop a lot, even during I sleep, 2nd day wake up, the battery drop a lot, before upgrade, I no need to charge my phone during working,(I very less use phone during working), but after upgrade I need to charge it during working 🤦🏼‍♀️🤦🏼‍♀️🤦🏼‍♀️, regret to upgrade 😔，Apple, pls help to expedite resolve it. Thanks

Ios18 public is killing my battery Something way off! Was a beta user not really a problem but since the public release half a day at best out of battery never had a problem lasting a day in ios17! Having to use power save mode from 100%! Any ideas?