My iphone 12 is just 2 days old and I am facing really bad battery drain overnight. I had almost 90% left for couple of days before I had gone to sleep and woke up with a remaining battery of around 65%. The battery chart has nothing for these hours. And moreover my mail push is set to manual and I had turned off wifi, bluetooth, location and mobile data. Is there something I can do to stop this?
[Re-Titled by Moderator]
iPhone 12, iOS 14
After a couple days of experimenting.
Let me give you scenarios/examples with no regard to any other settings other than those mentioned being turned on or off.
iPhone 12 Pro running iOS 14.3
SIM card installed, WiFi on, Cellular On, Bluetooth in Standby (Turned off in CC to disable new connections, but still enabled)
Battery drops between 15 and 30% over an eight hour time frame while not being in use. (This was the case for a couple days, until I realized something was clearly wrong)
SIM card installed, WiFi off, Cellular off, Bluetooth standby same as before
Battery drops around 10% over the same time frame (Better, but still not satisfying)
Now get this!
SIM card taken out, Wifi on, Cellular off, Bluetooth same as before, I also turned Airplane Mode on for the sake of it
Draining between 1 and 3% , over the span of 8 hours.
I know, it seems absolutely silly to use an iPhone without a SIM card, but as long as this bug is not fixed taking out the Sim card might be your best option to prevent your battery from draining over night. Or you just simply keep it on a charger. Keeping the SIM and at least turning off WiFi and cellular or putting the device into airplane mode should make the battery drain a little less too.
Some other things you might want to switch off, if only to test for a couple days to see if battery life improves and slows the drain. Keep in mind, you can disable everything temporarily and don't have to worry about anything breaking. If something needs a certain thing enabled, iOS will most likely give you a prompt anyways. You can go back and enable everything again, but until a version of iOS 14.3.x or 14.4 is released that addresses the those kind of issues, it's the best and to be frank, the only thing you can do.
System customization also updates in the background constantly ( if you turn it off, Dark Mode/ Appearance will still be able to work in sunset/sunrise mode, night mode however will work only when you put it on a custom schedule, and optimized battery charging will not work (even the option itself in the battery menu is enabled) if you have Significant Location and/or System Customization disabled).
I don't mention any of those things like turning off Background App refresh, dimming your display etc as those can be found in literary every 'iPhone battery savings' video or article.
It is clear that the issue can be pinpointed to the cellular modem, which can only be put into completely pause if there is no SIM card in the device. Airplane mode alone does not seem to fix the issue fully nor does turning off Cellular data help much if anything.
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.
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.
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?
Same for me too. I usually sleep by 11pm and wake up by 7am and from 12 to 6 there is no information for battery usage and i lose around 15-20%. But if i turn in aeroplane mode it reduces to 2-3%. Try it if you are okay with that. Aeroplane mode on and wifi on.
Tonight I changed network setting. I use 5G auto instead of 4G, I set it on 4G because I don’t have a 5G contract and I thought it was the best setting for me. Tonight I only had 4% drain with everything on and it was almost 10 hour standby. I will keep trying this settings some days now.
As we do not have 5G network yet I set up 3G instead of LTE. Overnight drain 7%.
Just turn on airplane mode
Did you update to IOS 14.4? Yes there was a software issue. But it seems to be resolved in IOS 14.4
This helped me:
Note: Save your photos before doing this.
I had to return the phone to Apple. It is a known problem.
I came here to offer the suggestion of backup/restore a tried and often true remedy for issues like this through many generations of iPhone.
Unlike you, I've been on this forum for more than a decade and I participate in many threads trying to help people. You clearly don't like that I offered a possible solution and that's fine. But I at least offered you something.
I don't believe because I don't have an issue should prevent me from trying to help people. If my suggestion isn't something you or anyone else want to try and you'd rather hope some magical solution is in a future update, that's fine. You can wait. But I'm suggestion that's not the best solution for a solution for an issue which is NOT affecting all iPhone 12 owners.
I am curious how you've selected the cellular band your phone goes to? If you go to Settings > Cellular > Cellular Data Options > Voice & Data - What have you selected? Me personally, I use 5G Auto, but I also live in a city in the US and my cellular provider is AT&T and they have recently turned the 5G service on here. If you live in a city where 5G service is minimal to non-existent, you may want to change the setting on your phone to LTE to stop your phone from constantly looking for a 5G connection which may not exist for you.
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
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%
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.
Regarding battery drain overnight. I have found that if I reboot my phone before I go to bed I get no battery drain at all. Note. It is still on but I don't use it after I restart it.
I was losing 20%+ per night
This is not very practical but might give some clues as to why it happens
iPhone 12 battery drain overnight
