iPhone 12 battery draining fast

I'm only using one physical sim - o2 DE currently on o2 UK because I'm in England and I have the exact same problem. 15-20% drain overnight.

Will try an eSIM in Feb and see if that makes a difference if Apple haven't sorted it out before then

Usually, my phone discharged on 20-25% at night.

Previous night I turned on the flight mode and no one percent of battery has spent.

This night I switched cellular from LTE to 2G - just 5%, much better than usual, but not ideal.

Hi,

I have the same problem, on my iPhone 12mini, I lost overnight from fully charged down to 50%. So I tried turn off all activities such as backround app refresh and turn on battery low and lost was only 38%. Apple says let your new iPhone do heavy housekeeping it drains your battery but it should be only for first 48-72hours. So I tried after one week but it’s still same, from fully charged battery drops down approx to 60%.....;(

That is better than mine when connected to o2, I'm looking at 30% overnight. Again, people think overnight is not a problem, one could charge it, but the drain happens also during daylight (it's not a dark drain) and causes extremely poor battery life, worse than iPhone SE 2020.

Thanks for your report, this is another proof that it's somehow carrier related. Certainly Apples fault but carrier related issue.

It seems to decrease from 98% to 75% ish... I'm not sure if that's normal when the phone isn't being used, just exposure notifications. But why is this even working when the phone is stationary and in the same location?

My 4th replacement unit behaves quite strangely compared to the previous ones. When it's fully charged or if it's charged up to 90% at least, battery drain overnight would be 0 to 4%. During the day, it behaves well. However when the battery reaches the 80% mark, the 4% per hour battery drain on idle kicks in.

But you’re not using dual, right?

i think we could narrow it down to two main issues, one when using single sim it seems to be carrier related and two, DSDS causing the same battery drain no matter which carrier.

Apple really screwed up the new modem firmware big time.

I don't have the luxury of changing carriers, on a contract. But I do believe this issue is isolated to the 12 series rather than the network. Why? Other phones (Android and even the 11 series) don't experience the same issues.

Hi, I was having the same problem, exact same settings that I had on my previous iPhone 11 Pro and the battery was draining. I read on here with a few other people that they switch to EE and it resolved. I can confirm that I switched my Sim only deal from Vodafone to EE and it resolved straightaway I went from 15 to 30% drain overnight it’s now 3 to 4%. There must be a problem with compatibility with some of the networks and the new modems.

As shown in the screenshot I shared

5G =disabled and 4G enabled, single SIM card, WiFi and Bluetooth also disabled.

My plan does however include 5G but since disabled in settings that should not make any difference.

For few days now I’m seeing less of a battery drain than before. But this still might be temporary, as it already happened before 🤷‍♂️

Not sure what helped exactly but here’s the list of all my adjustments (I hope I didn’t forget anything):

• Siri off, including all apps
• Background refresh is off
• Notifications off for all social apps or apps with potentially high notifications amount
• email push is on (doesn’t seem to affect anything), for gmail using Gmail app, for iCloud using Mail app.
• Location services while using only or never
• Raise to wake is off
• No widgets on home screen which might require network (no weather, calendar etc.)
• Signed out from iCloud and signed back in, and hard reset
• Vibration is off
• Alert volume low
• Back tap is off
• Dual sim is off, using eSim only

IPHONE 12 Mini, bought on 1/12

Update: 69 hours from the first full charge after purchase (charged by pc while recovering backup) 

Battery: 13%

Usage: 2 pics, 6 minutes of gaming, few social notifications (no Fb or Instagram), settings, 3 minutes apps update from the App Store, 2 very shorts call. I am purposely still using the 6s to test the 12 mini on standby. 

Consume about 1% per hour (idle) 

Night consumption: first night 4%, second night 2% (in airplane mode), third night 4-5%. Only wifi, LTE only for 3 hours in 3 days. The old 6s at night remained at 100% (battery life 76%!)

Hello everyone,

My iPhone is also losing 20 - 30% battery in standby mode during the night (no airplane mode on).

I have read all the pages in this thread, but could not solve the problem.

I have an iPhone SE (1st gen) and since iOS 12 I am struggling with too high battery consumption in standby. I had found out about 2 years ago that only a complete sign-out of iCloud would solve the problem. By this I mean a complete sign-off, not just disabling all iCloud features in the settings.

Apple support couldn't help me at that time (everything was supposed to be fine) and after discussing the issue with several new support people for weeks, I finally gave up and accepted the fact that I might have to recharge my iPhone twice a day.  

Due to iOS 14, the problem has now worsened to such an extent that my iPhone is actually just a landline phone. In my opinion, the iOS 14 specific bugs that have been discussed here add to the general high standby battery consumption that has already existed for a long time and that might have gone unnoticed by many people. You would not expect that anything might be wrong, if you could use your phone for one to three days, right? 

Fun fact: I have another iPhone SE (1st gen) - my work phone. This runs absolutely perfect in standby (on iOS 14). The only differences are the memory, the network provider and iCloud. Everything else is the same. Why one iPhone SE is constantly empty, but the other one can stay in standby for several days, seems to be Apple's secret.

Just an idea: If you have the time and are willing to experiment, you may want to test as a last resort whether a sign-off from iCloud has a noticeable effect on standby consumption. Please note, however, that logging out of iCloud will cause saved Apple music songs to be deleted from the iPhone (I think).

Good luck and looking forward to your findings!

Guys, this is apple's ****** software work. They don't need to release (crap) every year on schedule without it being ready, yet they do under the new CEO for stock valuation reasons. This is not iPhone 12 related. It is most likely more visible on them since the CPU is really powerful when needed (and can use a lot of battery) - most likely because the OS is broken, the fast cores are always running

For those of you who have Macs download Xcode and connect the Activity Monitor instrument to your phone and look at running processes (first with cable to enable wireless connection, then connect wirelessly so there isn't power applied). I bet you that you will see medianalysisd-service, medianalysisd, DTServiceHub and duetexpertd using collectively more than 50% of you cpu while the phone is idle and even when not connected to power. Check your CPU Time - I bet backboardd will be the top or one below - this is an old issue since 2015.

And I am seeing this on stock (non jail-broken) iPhone SE ever since iOS 14 (currently on 14.2), two of them actually using the official Xcode instruments. iCloud is not used for anything except contacts, background app refresh is enabled only on handful of apps, all widgets are disabled as well, no automatic updates of any kind are enabled for their the OS or the app store, AirDrop and all other possible uses of AWDL are disabled, phone sitting on stable surface so no accelerometer or touch data is coming in, most of the location services being disabled for the OS, except find my iphone, manual time zone selection, etc.

This is not iPhone 12 issue. How apple loses sales: I was thinking to upgrade my 2 first get SEs to 12 minis, as apple finally decided to think with their head and release a phone with sensible dimensions, but this shoddy software work makes me postpone and reconsider that purchase more and more.

techPM, a poignant research of their timeline.

I would agree that there was sort of a Golden Age of code quality software released from Cupertino. As the network effect took hold, the user base exploded and here we are now with millions of devices in need of help due to hardware issues. The real question is whether Apple knew about the extent of it before their decision to release. I wonder if not due to the atypically late mid-Nov release of the device, there could be a number of defects baked in that they were trying to address and couldn’t wait longer to release.

Of note, be careful not to call out Apple in a negative light in the discussions forum as they will remove your comments swiftly and possibly suspend your account. Yes, even Apple is playing that game.