iPhone 12 battery drain overnight

yes, but not really yes :)

before going to sleep, I turned off WiFi in the control center by pushing the blue button...I forgot to do it in the settings so I don’t know when but the mobile turned the WiFi back on automatically during the night :) I also closed all opened apps and deleted one game that my son downloaded few days before and I saw it ate the battery very much ( Hole.io).

But the result was nice: 4% decrease during the night. On the following night the decrease value was the same small and without turning off the WiFi and closing apps.

It means that WiFi connection does not effect on this problem. As the first dramatical 40% decrease happened only once with me so I might not be afraid of having a wrong mobile, but we have to be very careful on what apps we download cause they can even do tricks in the background while we are sleeping. On the other hand if this dramatical decrease of battery happens once and not every night so just check what you have downloaded or changed before it happens. If it happens more or every night so it’s still a question to be solved by the manufacturer...

I just spent about 45 minutes chatting with Apple support between two different advisers and they told me ‘this is not a known iPhone 12 issue with Apple’. At the end they told me what they always tell you to do, delete everything and set up as a new phone. I’m sorry, but it’s unacceptable to be told to do that or that this is happening with my phone which is seven days old. iPhone 12 here by the way.

Hey everyone. I started using my brand new iphone 12 mini 3-4 days ago. The battery lasts good throughout the day (for me at least coming from an old iphone 7) but at night it always drops average 20% (sometimes less usually more). I never have wifi on during the night, i always close the apps running like a control freak, as soon as i got it i even followed a youtube video on how to improve battery by turning off a bunch of stuff. I only charged it with the cable apple gave and a fast charging block. But during the day i dont notice this huge drainage. Two days ago i took it at work and after a 8.5 shift, with 20mins usage of the phone during my break and it only lost 10%. So i dont understand what’s differenr at night. There’s no different in drainage at night whether battery is at 40% or 90%. If somebody figures out something please let me know 😰😰

(right now im typing on my old iphone 7 12%, was 30% before i slept and i fell asleep on tik tok, while my iphone 12 mini only had an alarm clock went from 40% to 20%)

Battery life on the 12 Pro is nowhere near as good as my 11. With my typical usage, I’d never use more than 50% over 24 hours. With the 12 Pro, I’m charging multiple times a day. That’s with the usual LTE only mode (although on WiFi most of the time), same apps etc installed. I was expecting it to be slightly less due the smaller battery, but not twice as bad.

It is definitely a bug in 14.1. I am experiencing the same with two iPhoneSE (1st gen). When I connect them to a debugger I can see the medianalysisd never stops, even on battery, as well as some other junk processes. I have resorted to deleting all photos and videos on one of my phones, and the battery drain on idle on it has been reduced significantly

iPhone 12 Pro Max

iOS 14.2.1

Go to Settings>Mobile Data>Data plans>Primary>Network Selection>Toggle Automatic off and choose your carrier manually.

Tested this fix today in my usual use case.

Time: from 6:30 to 17:30

Battery %: from 100 to 82

Before it was from 100% to 50%.

Drain fixed I think.

I’m using dual sim functionality and after testing extensively I found that the problem is with selecting mobile data on your e-sim. If I select mobile data on esim than discharge rate is 20% overnight and if data is from primary sim (physical sim) than maximum 1% drop overnight. I have tested with various combinations like switching off e-sim off and then physical sim off, switching to primary sim data overnight etc, the issue is with e-sim only. Otherwise battery drain is normal as of iPhone 11 series.

idle time overnight: 8 hours

Discharge rate on e-sim: around 20%

Discharge rate on physical sim or physical sim mobile data or switching off esim overnight : max 1%

Do you use dual sim ? if you do, try to switch one sim that is not used for data to 3G.

Settings -> Cellular -> Cellular Plans (Select the sim you do not use for data) -> Voice & Data -> 3G.

That fixed the problem for me. Temporarily :D until apple release a fix.

Hey everyone, iphone 12 mini here. I posted on this thread before about my huge drain overnight, usually more than 20-25% per night.

After playing around with some settings my battery only went down by 5-7% last night.

In the mobile data settings (i do NOT use dual sim as other people have noted) i turned low data mode on, even though i want to try it without this tonight, and then in the Mobile Data settings i scrolled all the way to the bottom and turned off Wifi Assist and iCloud Drive. The last two definitely improved my battery drain for some reason, so give it a try.

I confirm this issue has some connection with dual SIM functionality. Last night I had both SIM and eSIM active and battery drops from 95% to 33% over night. I disabled physical SIM, kept eSIM only and during last 3 hours battery did not drop even 1%. I will test it during the night.

I think the problem is with connection, data and stuff in general cause even without a dual sim there’s been a lot of reports of huge drains. Last night i disable low data mode and dropped from 43% to 9%. My wifi and data were turned off and i never have any connections on during the night.

On my iPhone 11, I had no need to disable any of these and the battery life would be an easy 2 days. On the iPhone 12 Pro with the same apps and settings, it needs to be charged often twice per day. It's nothing to do with background app activity etc, it's something to do with the phone itself.

It's also not dual-sim related, I've tried both physical sim and migrating that to the eSim, and still have exactly the same thing going on. Really not impressed :(

does anyone know if this a universal problem with the iphone 12 line or is it just several phones and we need to change our faulty ones? My 4-year old iphone 7 with a damaged battery works slighlty worse than my iphone 12 so im really not happy about this development in my 2-week old iphone 12

Hi all,

I am having similar issue. New iPhone 12, about 5 days old. Battery drains about 10 to 12 % during night on a full charge. I have set a bed time schedule between 10:30 pm and 6:00 am and hence no notifications come through, however there is a constant rate of battery drain during this period. What surprises me is that when you look at the battery statistics, there is no app activity during this period, yet battery is draining.

I suspect it could be the bed time schedule but, because my wife also has a iPhone 12 which is about 4 weeks old and bed time is not scheduled on it and I don’t see any battery drain. Remains almost 100% charge overnight.

I have disabled mine today to do some testing and I will report back. Even during the day with notifications, usage the rate of drain is not significant and less than during bed time.