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.
I have the 12 Mini. I'm not sure I solved the problem. I'm still checking phone once in awhile to see if it drains. Turned off Bluetooth altogether. And turned off several auto-download things in apps and IOS updates. Also went to SETTINGS, CELLULAR DATA, and then toggled to off Wallet, and Music.
I do not get it, I had it once only right after I bought it. Do the system updates, and maybe enable dark mode. The battery does great for me. And you can leave it to charge overnight, it has a smart system of managing the charge not to mess the battery. But the 1st thing, do you have a proper charger for it, old ones will not cut it!
That's sad. Did you try upgrading to 14.3? How's the signal strength in your locality.
Jut go back again and try to get a replacement and that is going to solve the problem if you’re lucky enough to get a good one 😁
iphone 12 has the option to change network settings to 3g only. Settings > Mobile data > Mobile Data Option > voice and data > there select 3g.
With latest 14.4 update I can see it is better. It lost only around 5% during overnight. That seems good as it was around 20% earlier
Do what a half billion other users do:
Charge it when you sleep.
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.
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.
Universal means it affects EVERYONE. I'm telling you it's NOT universal. If it were universal, is should affect the two 12 phones in my home. It's not. It should affect the iPhone 12's owned by people in my office. It's not. It should affect people I know who own iPhone 12. It's not. If you go into a hospital and see nothing but sick people, do you assume everyone on the planet is sick? Of course not. Coming here and seeing even a lengthy thread is statistically insignificant in comparison to the number of devices sold.
You can keep you assumption which is false. You can wait for an update to come, which likely won't come. Or you can do something for yourself and see if the backup/restore procedure stops the drain, which is happening to your phone, but NOT ALL phones.
I have noticed, on more than one occasion, that my screen was on in the middle of the night. I have waited for multiple minutes for it to go back off... only to wake up later and it is on again. What I have noticed is that the screen stays on after it receives a notification and I have to manually push the power button to get it to lock and shut-off. I have tried disabling 'Raise to Wake' and restarted my iPhone 12. This has happened more than 10 times in the past few weeks and I have noticed significant power drain in the past few weeks. I am not sure if this related to the iOS 14.2/14.2.1 or if this existed from the very beginning.
Apple is not here, so Apple is not going to answer you. This is a user to user only forum.
Contact Apple directly for guidance. You can use the Contact Support at the top of this page or schedule an appointment at your Apple Store Genius bar or call Apple (if in the US) at: 800-MY-APPLE
I read all the messages and what helped is from 4G to 3G. When is 3G battery drain between 0 - 3% . If the battery is 100% when do not drain and when it is 99-98 when drain between 5-7% . When the phone is 4G the battery drain 18%. Мy previous phone (iphone7) did not have such problems. I hope Apple will done this problem.
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.
Yes, I am experiencing no drain with airplain mode but WiFi and Bluetooth on (approx. 5% over night).
With no airplane mode and 5G turned off (only LTE) I have a drain of approx. 20% over night.
So this has to be a connectivity issue (at least with my phone).
iPhone 12 battery drain overnight
