iPhone battery draining after iOS 18 Update

During read of all this comments I found one thing that I didn’t do after update. And it looks like that helps and battery drain is gone now, at least for phone.

Background: I’m using shortcut to turn off charging at 90%. Probably charge to 100 is needed after update to calibrate battery.

my solution: Charge battery to 100% and keep it that way on charger for 1h.

before: phone charger before night, till the morning 30% battery drop.

now: after night 3-6% battery drop.

Hello~ What is your current iP battery health?

Check the iPhone battery health and usage - Apple Support*

*Go to Settings  > Battery, then tap Battery Health & Charging. What’s the % there? If 80% or below make an appointment with Apple and have your battery changed…

~Katana-San~

try toggling off all background app refresh ... worked for me. A short term fix.

Hello~ Click on below…

Check the iPhone battery health and usage - Apple Support*

*Go to Settings > Battery, then tap Battery Health & Charging. What is the number there?

~Katana-San~

1. Try turning off your location services for the apps which doesn’t require them!
2. use low power mode

wait for apple to fix the issue with an update even i am facing the same issue and a bit of heating issue also!

I erased the phone (15 pro max) and started over. Nowhere near as warm when charging. Two hours since last charge, at 99%. I'll keep watching it but so far, so good. The four hour mark will be the next test as it was dropping to 76%. I deleted a TON of apps and turned off a lot of background processes. Granted, this should not have to be done and hope Apple finds a solution vs us trying to get janky with it.

Force restart iPhone

If iPhone isn’t responding, and you can’t turn it off then on, try forcing it to restart.

1. Press and quickly release the volume up button.
2. Press and quickly release the volume down button.
3. Press and hold the side button.
4. When the Apple logo appears, release the side button.

Battery drainage issue is resolved after updating to latest iOS 18.0.1 (22A3370).

Hello~ You needed your battery replaced when it hit 80%. I hope you are backing up your iPhone on a regular basis. The update plus a very seriously degraded battery can and will cause serious issues at some point. No battery lasts forever. Get it changed or get a new iPhone…

iPhone Battery Replacement - Apple Support

~Katana-San~

Yall can still downgrade to iOS 17.6 beta as it still signed, I had the same issue on my iPhone 13 mini. Just look on google.

I’d update and then give it a few days. This update has a lot of Apple AI features that if you enable, will consume some daily battery capacity. It generally takes 3 to 5 days after an update for things to return to normal.

Did you do a forced restart? That’s helped many users. If you share a screenshot of battery usage by app we can see if it’s an app or two causing the excess battery usage. Here’s mine,

Hello~ Click on below and review…

If the battery in your iPhone drains too quickly - Apple Support

~Katana-San~

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.

My ipad9 was holding 10 days without charging (I use it mainly to read and watch tv in bed) .. after update to iPads18 I had to charge it every 2 days. It was loosing 40% of charge during the night, with cover (!)

I have the solution: I reverted back to iPadOS 17.7 and now everything is back to normal.

I wish that apple would spend more time on quality of products and software instead of delivering something every year without all functions being implemented and core operations of the OS totally faulty. This is not ok apple. This is not the first time too.