iPhone 12 battery drain overnight

Yeah, same problem here! 4 nights of new iPhone 12 drain:

1st night -7%

2nd - 20%

3rd - 13%

4th - 9%

that is a very very bad result and a drain while in the idle is a very big problem.

despite that my phone gives me around 8-9 hours of a screen on time in average

can't really imagine what it would be after that bug with the idle drain is going to be fixed

prasaanth28 has identified a real issue here.

My new iPhone 12 Mini drained completely from full 100% charge to low battery shut-down overnight last night.

• Received it four days ago (Friday Nov. 13th)
• Charged it while setting up Friday night
• It lasted through yesterday (Monday) afternoon with about 2 hrs screen time per day, and several phone calls a day at about 10 minutes each, which I found impressive.
• At 9% I plugged in late yesterday afternoon.
• A couple hours later at 100% I unplugged it.
• Overnight, the only app running was the alarm clock, which should not drain 100%.

This morning it was shut-down.

This appears to be a real problem.

With no apps in the background, and only a clock running, even if it's searching for 5G it should not drain completely in 9 hours, especially when it lasted three days of normal use, including the alarm clock running for two nights, immediately prior to this event.

It doesn't take much to understand that if your battery drains from 88 percent to 30 percent while IDLE and not being used in the middle of the night, that there's a problem. Doesn't take a level 10 to understand that. It's a problem that needs fixed. This entire thread is exactly about trying to SOLVE that problem. Some level 10's dismiss any discussion about it and write people off as un-intelligent because they don't agree with your bandaid approach of constantly having to plug the phone in. Is it helpful to write people off who are looking for a real solution? Does that qualify as "helping people for many years?" And I'm about to leave this forum for good, as it seems to have some level 10s that are quite dismissive of any other opinion than theirs in regards to my comments. All I got was grief from this forum, and all because I dared to want to solve a big problem with my phone. Shame on me. I should just be quiet and plug my phone in and do as the level 10s say, because they're the smart ones.

I came here to find a solution because I am experiencing the same issue.

this is my very first iphone (iphone 12 mini) ever that is 3 weeks old now.

@QuickTimeKirk or other advisors who advice to charge overnight: please, be quiet and leave this conversation. you are not helping at all and only provoking aggressive behaviour.

charging the phone overnight makes no sense because the issue is not directly night related and can accure over a usual working day. so, would be the advice of level 10s to have the phone plugged in all the time?

I don't have a charging brick (I am lucky enough that I have USB-C on my computer; I refuse to buy one, I am happy with the apple product but not with the apple marketing strategies) so I am forced to charge the phone on my computer that is not running at night.

the issue accured twice now with about a week inbetween which is the rason why I now am looking for a solution.

is replacing the iphone realy the only solution?

Most of us charge our devices when we sleep.

Try it. You'll like it.

There is a bigger thread regarding this issue where I and many others have explained the issue in more detail: https://discussions.apple.com/thread/251956914

I have also seen similar threads on other forums. It is a real issue and seems to affect all iPhone 12 models. I’m hoping it’s an issue with the modem firmware that can be fixed with an update. I’m averaging a loss of about 10-15% at night. However some night I’ve lost 25% and some nights only 3%.

this is the problem. i have this problem on my iPhone 12 too.

When I first got the iPhone 12 I set it up as new. A week or so ago I also tried a full DFU-reset and set it up as new again. Neither helped with the idle/standby drain.

The battery app reports no usage at all during the night, just a steady battery decline.

As for the recommendation to charge at night, sure that might help against the nightly drain, but I’m also seeing this steady drain of about 2% per hour during idle/standby during the day as well. And it’s severely affecting the battery life.

Also, charging at night is not optimal for battery health. The Optimized battery charging function might help alleviate this for some, but if you have an unregular schedule it doesn’t work well.

1. How good is your 5g service in your domain ?

If its poor to none existant switch the service Ariel OFF in settings right now

1. Do you use social media such as TikToc , Facebook or Instagram . These use battery to update in the background especially TikToc .

Make sure you Quit them fully before you sleep the phone

Those are the prime drivers for flatting your battery overnight or indeed at anytime

No it’s not a bug in the operating system at all

If you have no or very weak 5G service the phone hunts and poles in an attempt to find a tower constantly using up power to do so.

Turn off 5G in the setting

If you have one of those social media apps especially TikToc, those are the poorly optimised software and exponentially eat battery power . Again QUIT THEM fully before sleeping the phone AND turn OFF back ground refresh in the phone setting now

Do these two things and you will see a massive improvement in battery life

Man, you are just kidding) i don’t have 5G at all, I use the LTE mode.

I have a background app refresh off, before the night I usually close all of the apps)

i tried even with the airplane mode on, but that didn’t really improve my idle drain.

But I have very good results despite that fact) now I got 6 hours of screen on time and 40% of a battery)

the only problem is the idle drain and heating. And this is definitely not the problem of my own phone, there are too many topics here with the same problem, and there are at least 2 with too many “me too”) so I’m pretty sure apple knows about the heating and battery drain problem and I think they are going to fix this

Recently bought iPhone 12 and I'm not happy with the battery backup. I have disabled lots of features and in spite of that, backup isn't great. Biggest problem is battery drain overnight being idle and has been noticing that it drains more than 15-16%. I have been using iPhones for the last 10 years now and have never faced an issue like this. I'm not happy with my new iPhone 12 and I need an immediate resolution. I'm on iOS 14.2

Hi all, I solved the issue for my iPhone 12. Turned out I had a bad celular reception in my home, only two out of four, and I didnt even know it. This apperentry makes iPhone work hard just to stay connected even when you use wifi (to be able to receive calls) and only airplane mode turns cellular connection (not data.. connection) off. I was loosing 20-30 percent per nicht and it was awful. What I did is activate Wifi calling. My carier Telekom In Germany supporst it. Today I lost like only 6 percent while the alarm on my phone was going of for an hour or two. So the battery drain overnight could be even smaller

TL;DR poor celular signal at home causes battery drain. Use wifi calling

Hey, that’s great that it worked for you!

Unfortunately, my phone already had WiFi calling enabled, and the connectivity conditions didn’t change between losing and not losing charge.

Unfortunately I don’t think this solution is addressing the root problem.

It’s more like a normal reason for batt drain.

You got lucky with that being your only problem though, and that’s awesome!

Thank you for a positive attitude! May I ask you if turning the airplane mode affect the battery drain on your iPhone? For me airplane mode temporarily solved the problem because it turns the cellular reception (not data) off. If turning on airplane mode doesn't affect your battery life, then yes, there is a totally different kind of a problem.