iPhone 12 battery drain overnight

Charged to 100% before sleeping and after about 7 hours, dropped to 89% :(

So it appears it’s software related, unless I have also received a defective phone for the second time, which is unlikely.

Have to wait for software update over the coming days.

It hasn't solved it for me, either.

This is my battery usage overnight, iPhone 12 Pro, background activity deactivated, phone in Aeroplane Mode:

So which app is doing all this background activity? It's not clear from the battery usage display, but I've been experimenting, and it's the Music app. Two nights ago I deleted the Music app, and none of this background activity happened overnight. So, Apple, we have a problem. One of your native apps has a big, hairy bug; at least it does for me.

My previous iPhone 7 Plus was cooked by this process and I don't want it to happen to my fancy new 12 Pro, so I'm going to have to delete Music again. But I want the Music app. I have lots of music I want to listen to using my phone, and as far as I know there's no alternative to using Music.

Something needs to give, Apple. The 14.3 update didn't fix this, and it's starting to get annoying. What's the story?

I doubt that. I havent used mine since i got my ip12 mini. Oh sorry, havent installed. I use YT music as my main and have deleted apple music since. Still having drain issues.

but suprisingly, my phone did not drain this night. Look

My phone didn’t drain last night and what I did was I connected my galaxy watch and i turn off air drop and i just charged my phone at 88% around 22:00 o’clock. I will check if the issue is gone. Background refresh on location off but i will turn it on to see iff that is the problem I deleted music app and all widgets

Guys just an update, i havent seen any drop on my battery after several days. No modification on settings whatsoever. I think this waa triggered by the new IOs update so im positive to give yours sometime and will get fixed.

I don't know from where you guys are switching from 4g to 3g. iphone 12 doesn't have any 3g enabling options on its cellular menu. It only has 4G/LTE and 5G switching options depending on your carrier. some has 4g and 5g and some has LTE and 5G. which is by default set as 4G or LTE but in case off excessive use of internet you can toggle it to 5g. Furthermore data mode is by default set on Standard basis. which can also be change depending on situation you need. I think the area or carrier of your iphone doesn't has the ability of 5G yet. that's why you guys can toggle between 4g and 3g.

But I also have find some solution for me as I was very upset because of this from pas couple of weeks. After discussing and diagnosing this problem with apple care they suggest me to Restore my iphone from itunes. I did the same as they advised me So restore my cellphone with itunes after taking backup and I think finally I am relieved now. my battery percentage only dropping from 3 to 5 percent from last 3 nights consecutively. I turned of wifi with both sims are enabled (No flight mode) in one night and other night turning on Flight mode, only setting I change is I Enabled Low Power Mode and it working great now. I will update it if I face some problem again. But right now it is going good.

Update to my previous post. iPhone 12 Mini battery woes have continued. Two nights ago I turned off all Background App Refresh and turned on Low Power Mode. As seen in the first picture it still lost 35% in 6 hours with zero use.

Last night I just left it alone and off the charger from 9:15 to 7:15. It lost 55%.

I am exchanging it today at Verizon for a new one. I hope it works! I’ll have two nights with it before I have send in my XR trade-in. I don’t want to let it go until I know the Mini is a go.

My cousin also has a 12 Mini, on T-Mobile, and reports excellent battery life. She did an experiment for me and left it off the charger for more than 12 hours. With at least an hour of use she lost 11%. So it’s only a subset of 12s this is affecting.

Been trying airplane mode 2 nights now and still have WiFi and Bluetooth on. Both nights there have been only 4% drain witch is ok for me. It’s not a solution to be forced to use airplane mode at night so I hope apple is aware of this and are going to fix it ASAP.

A couple days ago I realized, even if airplane mode is on but Wi-Fi including Wi-Fi calling enabled, I can make/receive calls, send and receive non-imessage texts just normally. This is game changing. If this means I can just use my phone in airplane mode every time I am connected to Wi-Fi someplace, this is going to greatly improve battery life in every way. Because it means that the usual battery drain while having bad 1 bar cell reception in a certain spot in a building suddenly is eliminated. Granted there has to be Wi-fi.

Here's a screenshot. Last charge to 100% was Saturday 8:30AM. Now it's Sunday midday and I am on 88%. I admit I don't have all too much screen-on time since yesterday however it was quite a lot of standby time. Considering that before, the phone would drain to 88% at the very least just sitting there idling over the course of 8 hours. No matter day or night. (I am saying 'no matter day or night' for all the people who insist everyone should charge their devices over night every night. Because the phone would drain on its own during the day just doing nothing as well.)

Also a thing I notice (especially on my iPad Pro) but that could just be placebo or something like that. If you drain your device to ~40/50% and then charge it back up, it usually has less standby drain and overall lasts a little bit longer as opposed to already charging it back up when it's only on 80%.

Also, I don't like Significant locations being turned on, which on the one hand bricks optimized battery charging for me but since I don't really have a steady charging/usage routine it would mostly likely not engage for me anyways, therefore it isn't a big deal because I plug in my phone when it drained around halfway or sometimes even sooner, charge it, leave it plugged in sitting on 100% for one hour max. I also noticed the battery lasts longer, especially it sitting on 100% significantly longer if it has been charging for just a little bit longer after already displaying 100%. If you unplug right when it reaches 100% it will mostly likely not sit on 100% for very long.

My 12 mini initially had serious standby battery drain issues. I tried different combinations of settings and nothing worked, but this week - without any update - it seems to have resolved. Starting Jan. 19 I took it off the charger at night and saw minimal drain, but daytime longevity has varied significantly, some days acting like a normal iPhone of this size and other days draining quickly. Yesterday the battery performed like a champ. As you can see here, I removed it from the charger at 12:37 am and 22.5 hours later at 10:58 PM it hit the 20% low power warning. While screen-on time of 4.3 hours isn’t great, that’s battery life I can certainly live with, and I hope this is the new normal for my mini.

when I updated to 14.04 it fixed my problem. Then I updated to 14.04.1 and it was fine, but today I woke up to this... as you can see nothing in the background... let’s hope this was a one time thing. I’ll check again tomorrow. But it is still not ideal. You just can’t trust iPhones when they’re idle. 🤦‍♂️ and just “charging it overnight” is as much of a solution as is dying to avoid sickness. It works, it’s just not very ideal. Lol

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