Extreme Battery Drain After iOS 18.3.1 Update on iPhone 12

I’ve got the same problem with my 12 Pro. I’ve always escaped the battery drain issues that occur after most iOS Updates but this one I have not. I’m losing battery massively. Just logging in to this page and writing this post is causing noticeable loss. Like yourself I have gone through every setting. Every app. Nothing is on that would drain. I’ve always been very conscious of background activity since I became an Apple user way back with the 3GS and never had problems. Until this update.

It’s showing 85% but like I said, I’ve never had an issue with battery drain after an iOS update until this latest update. I’ve kept my phone in good working order. Never over charged it. Kept everything to a minimum and now suddenly the drainage is appalling.

You are basing my usage on that of someone hammering their phone. I’ve not made a phone call on my phone for nearly two years. I use my iPad for most things. Either way, even if I absolutely murdered my iPhone doesn’t change the fact that up until iOS 18.3.2 my battery was draining normally and then after the update it’s noticeably bad.

MooMooFutch wrote:

You are basing my usage on that of someone hammering their phone. I’ve not made a phone call on my phone for nearly two years. I use my iPad for most things. Either way, even if I absolutely murdered my iPhone doesn’t change the fact that up until iOS 18.3.2 my battery was draining normally and then after the update it’s noticeably bad.

The last update killed my battery! - Apple Community

Froid wrote:

Haven’t found a solution. I’ve tried everything except what you are doing, rolling back. I go to sleep with 99% battery on 2 iPhones. No background or location activity, apps closed, Bluetooth off, even WiFi off, apps up to date, battery health fine, yada yada yada. And I wake to 2 dead iPhones. Just hoping for a better update soon

Why don’t you charge your iPhones overnight?

MooMooFutch wrote:

You are basing my usage on that of someone hammering their phone. I’ve not made a phone call on my phone for nearly two years. I use my iPad for most things. Either way, even if I absolutely murdered my iPhone doesn’t change the fact that up until iOS 18.3.2 my battery was draining normally and then after the update it’s noticeably bad.

No, I'm basing my recommendations on how old your phone is, the reported capacity, and my understanding of how that reporting works.

What's the point of asking questions here if you are going to reject every suggestion people make? If what you want is for someone to say, "Yes, iOS has a known issue where it causes excessive battery drain," that's not going to happen because it just isn't true.

If you want to actually resolve the problem, consider taking people's suggestions.

Yes…after the latest 18.3 update my iPhone and ipad will not charge rapidly and stops due to battery temps. This is insane! Just spent over $2k for my iPhone 16 Pro and accessories for charging, ipad etc. These updates are becoming useless. So frustrating!

Rrrrr34e wrote:

Yes…after the latest 18.3 update my iPhone and ipad will not charge rapidly and stops due to battery temps. This is insane! Just spent over $2k for my iPhone 16 Pro and accessories for charging, ipad etc. These updates are becoming useless. So frustrating!

It’s normal for your device to warm up a bit while charging. Are you using a 20W adapter, that you expect rapid charging to occur?

Ditto. Settings are set to reduce background app updates, auto updates off and location services select only a few like emergency, weather, etc. the latest update has drained batteries over night like you said. So frustrating and hoping those Apple coders get it corrected soon. Technology is supposed to be working for us and not us working for it. Crazy!!!

deemon- wrote:

Did you find any solution? Did the 18.3.2 fix the problem? so the replacement was needed ... still in repair shop. They told me they were able to downgrade the ios to 18.3.2 but I am dubious now and maybe I should ask them to downgrade even further to 18.3.0 or something?

[Edited by Moderator]

Who downgraded your iOS? Did they remove a Beta Version? Because there’s no newer iOS version than iOS 18.3.2. You cannot downgrade your software version.

In my opinion and after speaking with tech support, it’s all in the update coding. Who knows but it is unacceptable for sure. So sad to see Apple diminishing quality control. I too did everything recommended and did a reset on both iPhone and iPad only to end up having to go back and re-apply previous settings. Apple is aware.. ughhh…

Still no data, here’s mine. I don’t need to see any graphs.

Now what is ur battery health my bh dropped from 84 - 80 within a month. After 18.2.1

Facing the same here, battery drain issue on my iPhone 15 Pro as well after updated to ios 18.3.1.. Battery health also seen dropped from 99% to 97% within only few days after the update.