iPhone 12 battery drain overnight

12 pro, one sim ios 14.3. Sim card removed and no more drain overnight at all. left with 100% charged and awake with 100%. However, after 30min reading the news dropped down to 88, which is abnormal.

Try to set the phone to do not disturb, had a similar issue over the weekend and it was due to multiple notifications overnight, that keep putting the screen on, specially like a group chat or some similar

Got only a 1% battery drain last night. Here is what I did: I restarted the phone and turned off location services. I’ll be testing this more and see if that’s the problem.

Try torn off airdrop. Im at second night and my phone stop draining

Just go back to the store and get another and give the broken one back. At least that’s what I did and look no battery draining

I switched to 3G instead of LTE and now no drain during thr night. We have probably poor network coverage therefore switching to 3G helps

Apple isn't listening here on this forum if that's what you're hoping for.

None of my phones drain. None of the 12's of co-workers drain. Waiting for an update which likely won't do anything for this is not the best solution. This is NOT a universal issue and this thread of 4 pages hardly suggests out of the millions of phones sold and this being the most used iPhone forum in the world suggest this isn't an issue for many people, to be honest.

You should do what I suggested above and do a backup restore. Otherwise, it does make infinite sense to charge your phone at night while you sleep. You wake to a phone fully charged for the day, which is also backed up from the day before.

Sunday, my phone was powered on and not really used much all day from 7:00 AM when I got up, till after 11 PM when I went to bed. The battery percentage remaining after that many hours connected to Wifi, checking email some, but not much else was 92%.

Try the backup restore procedure on your phone.

Why people need to isolate that problem on their phones if that is not the only their phones problem? That exist in “some condition” with every phone, because people have had 4-5 replacements and the problem still persist.

but it doesn’t persist if you change a phone to an older with intel modem(like 11) or change a Service provider. With absolutely same conditions.

so to say, a have a friend with iPhone 12 and facing no issue

like me, but he has another SP. I installed his sim into my phone, then I installed my sim into his phone and the result is: my phone stops draining, his phone began.

this is the issue, and user doesn’t have to change something like an SP, because too many of users are contracted with them, Apple has to solve that problem, because this is not the fault of the users.

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...

Honestly, when I turned off my physical SIM (eSIM active only), battery drops 4% only during the night, which is completely fine. So in my case, issue is for sure connected with dual SIM functionality.

I think,i've a solution. Yesterday, just turned LTE to 3G and for the whole night ( about 8 hours ) the battery drops only with 5% I think this is OK,before that the battery drain even with cellular turned off was about 30 to 40%

2nd Update: I got my replacement 12 mini from Verizon on Saturday. Battery life during the day while setting it up was good, so I was hopeful. Oh, but when night came it dropped about 60% the first night and 48% the second night. So I threw in the towel and set up one of the many 5w chargers I have around to charge it all night.

Battery life today has been great - exceeding my hopes for the small mini. Off the charger at 100% at 7:22 am, and as of 9:12 pm after 14 hours of moderate use it's at 40%. That's comparable to my XR.

The replacement having the same problem tells me it's gotta be a software problem and not hardware, as it's unlikely an iPhone mailed to me from Verizon HQ and the one I got from the local store came from the same batch.

The replacement does have a better screen. The first one had very aggressive Tru Tone settings that shifted it so far to the warm side it looked more like Night Shift. The replacement has more neutral tones more consistent with the LCD Apple screens.

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.

Homescreen time accumulates because you are unlocking your phone, swiping through home screen pages etc.

Lockscreen time is basically every time you check the time, a notification lights up the screen when the phone is locked etc.

The only thing you can do to reduce the home/lockscreen time is straight forward, use and check/wake up your phone less. Disable notifications for apps you don't really need to be notified by. Place your phone face down. This will still allow notifications in, but without lighting up the display.

Guys. For the past two days I have done the following:

Close all apps

Restart phone

Turn off wifi and bluetooth

Turn on low power mode

I have had a power drain of 6% and 4%. That is still better than 20%. I will keep testing.