iPhone 12 battery drain overnight

Can confirm this problem. My iPhone 12 lost 27% battery over a 6 hour night. At this rate of discharge, the settings are irrelevant. This is simply not acceptable.

This discharge happened even with background mode turn off for most apps, being connected to wifi, and no apps running. Cellular was on with 5G set to auto. 0 minutes screen on and 0 minutes screen off time during the night.

Honestly, when I turned off my physical SIM (eSIM active only), battery drops 4% only during the night, which is completely fine. So in my case, issue is for sure connected with dual SIM functionality.

As a test, I disabled sleep/bed time schedule (available in the health app) and the rate of discharge was about 50 % less.

The phone was charged to 99% and after about 6 hours of night time, the battery was at 93%.

so definitely the bed time schedule is doing something crazy.

iphone 12 mini update here. I thought some settings i turned off helped, and one night they did but ever since i am back to losing 20-25% per night. I have turned off even more things like my night shift schedule, all background app refresh, all data connection options. I even use low power mode when i get below 50%. I am very upset, this is the worst battery i’ve experienced on a new phone and i hope they come up with a solution fast.

Luckily I am not facing any such issue with my 12 Mini but I understand, this is a major issue and a lot of users are facing battery drains.

Make sure you report this to Apple so that they take this on priority, which I am sure they already would be though.

nikolafromsliven wrote:

I'm really frustrated how does no one from the developers doesn't want to answer on these questions that people are discussing...

Really unprofessional from their sight.

You seem to be under the impression you are speaking with Apple and that Apple participates here? They don't. This is a user to user only forum and Apple isn't here. Just other users.

If you want Apple Support, you need to contact them directly. Use the Contact Support button at the top of this page.

Correct. I raised this issue directly to Apple support. Apple is fully aware about this issue and operator confirmed they see also complains on forum. We need to wait for SW update. Hope it will come soon and will correct this issue.

Well that's the thing. I'm not sure waiting for a software update will fix this for you and most others having this. We have iPhone 12 and 12 Pro Max. Neither has any battery drain issues. And having been on this forum for over a decade, there have been folks like you who have battery drain for sure, but it's rarely caused by a software issue with iOS. It's most often a result of a bad transfer of data from a previous phone to the new phone. Or an app which didn't get updated to the current iOS which is draining power. Or in the case of iPhone 12 with 5G capabilities, the wrong sim, or the phone constantly checking for 5G service when it may be spotty or non-existent in the area the phone is at night. In that case, changing the setting from 5G or 5G Auto to LTE may be enough to help.

And finally, I still don't understand WHY people don't just charge their phones while they sleep? The phone will not only charge, but will backup and be ready for a full day's use when one gets up in the morning. Virtually ALL of us who have been on this forum for years, do this nightly.

I just wish I could figure out why the screen won't shutoff after receiving an alert. It doesn't do it all day long, but every single alert that comes through at night.... keeps the screen backlight on until I wake up and hit the side button. I have watched it for 5 minutes and it doesn't shutoff and almost any time I wake up in the middle of the night... my screen is on. I am convinced this has something to do with it. I just can't figure out why it doesn't do it all of the time.

There was absolutely nothing referenced in the iOS 14.3 release notes which should have given you any indication this was being addressed in the update.

bhareedula wrote:

I have updated to 14.3 still I’m facing battery draining issue

Nope, it's not written anywhere, it's not must do, it just makes sense.

Not figuring out why your battery is draining is the real issue. Waiting for an Apple iOS update is foolhardy. But wait you can. And be frustrated you likely will continue to be.

Okay, so we will all charge our phones over night in order to hide issues with battery drain. Very intelligent proposal. Almost the same as having a car without lights. So instead of pushing manufacturer to repair my car, I will not use my car during the night.

While charging while you sleep makes sense, your analogy is actually pretty poor. Even if the phone is charging it still functions and you can still use said phone. Unlike driving a car without lights at night, which would be illegal, dangerous and foolish. Is there a reason you object to charging your phone while you're asleep? Does it in any way interfere with you sleeping? Can it harm the phone? Is the phone unable to operate while being charged?

Of course not to all three questions.

But you are missing the bigger picture. If your phone is draining over night, you need to figure out what is the root cause of the drain. You're just complaining about your phone's battery draining and there have been multiple suggestions provided throughout this thread to try to isolate the cause.

Read carefully all threads. I already reported a potential root cause. In my case, it is connected with active 2 SIM cards. Once I disable 1 SIM card, issue is gone. However it seems this root cause is not applicable for all cases of battery drain. Anyway I reported my observations to Apple.

All I want to say is charging over night is NOT a solution. Imagine battery drain even during the day, when you use your phone, drop from 95% to 33% after 7 hours WITHOUT any activity is just not okay.