iPhone 12 battery draining fast

I don’t know if this has been advised earlier in the thread, but all of us suffering should report our issues to Apple.

So if you’ve not already done so, please report your issues through Apples feedback page, https://www.apple.com/feedback/iphone.html

It only takes a minute and will hopefully make Apple fix these issues as soon as possible.

It's very easy. Just connect your iPhone to your Mac via cable. Your iPhone will show in finder, you might need to trust if it's the first sync. Then click on restore, the system will download a whole new copy of iOS and install fresh. I recommend setting up as new and not from back up after the software install. Here the support document:

https://support.apple.com/guide/mac-help/back-up-and-restore-your-device-mchla3c8ed03/mac

Good luck!

I think there are 2 different problems that people are experiencing.

• One is the battery drain regardless of Dual-sim or not - Personally I think this might be a bug or something with those peoples installations, so a fresh re-installation and with NO restore will probably fix that.

• Two is the one which also a lot of people are having, including me, which is that as soon as you enable the second sim the drain becomes constant regardless of how you use it.

I have two colleagues that have the exact same issue as me, when work sim is enabled (eSIM) we get really bad battery life. One of my colleagues used this on his iPhone 11 and there it worked fine (now he has the 12 mini).

I myself have the regular iPhone 12 and my 3rd colleague have the 12 pro.

One difference is as mentioned before in this thread, is the new 5G modem and I think there might be a firmware bug or a oversight. This might be on the carrier end since now on the 12 you cannot choose 3G as data source for the eSIM. You get locked to 4G only, and I think the 5G Auto has replaced this "3G" option (this is maybe the oversight I am talking about) but since ALL the 5G options are unavailable since this is not compatible with dual sim we are in a tough situation.

Picture bellow shows Dual sim drain between the yellow lines and a full day with single SIM used (physical SIM) between the green lines.

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Everyone should just report the issue either to Apple support or through the feedback page: https://www.apple.com/feedback/iphone.html

Perhaps it might also be a good idea to contact MacRumors and see if they can run an article about this issue. There are posts about this on their forum as well as on Reddit.

I am experiencing the same issue with my iPhone 12, its been around 3 weeks when I bought this new iPhone, I faced this issue during initial days but then the battery was stable and use to support for around 1.5 days but now it just drains quickly, doesnt stand even a day with normal usage.

I am not sure if the below article could be related, but some people have experienced this issue with older iPhone as well, post iOS 14 updates. So can this be OS specific issue?

https://developer.apple.com/forums/thread/649880

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

Please can we all have the time to fill this out:

https://www.apple.com/feedback/iphone.html

It looks like Apple hasn't acknowledge the issue (as of yet) and I think if we raise concerns regarding the matter, they'd probably look into it as a matter of urgency. It looks like all 12 series have been affected and not many users have noticed the issue.

Made a small test:

• O2 Germany standalone (over night nearly idle): 0,25% per hour, that's great!
• Telekom Germany standalone (nearly idle): 1,0% per hour
• DualSIM (O2 and Telekom) (nearly idle): 1,9% per hour

daytripper99 wrote:

Burying your head in the sand isn’t going to make this go away Apple.....should have learned the lessons from antennae gate, battery gate from before by now....just going to make Apple look bad again.

You're not addressing Apple here. If you want Apple to know your concerns, use the appropriate method:

Product Feedback - Apple

komie5 wrote:

Can I replace my phone with any other Iphone?

It is been 35 days I bought this set and I don’t want to be charged extra.

If you believe there is a defect in your phone, you can make arrangements with Apple to have it evaluated. You have a one year warranty (or more if you have AppleCare+).

Genius Bar Reservation and Apple Support Options - Apple

If you bought the phone from Apple, the exchange period if 14 days so you're beyond that. If you purchased the phone from somewhere else, you'll need to contact that retailer for information on their exchange policy.

Selzere wrote:

And here is a normal day at office, so with a very moderate us of the phone.

https://discussions.apple.com/content/attachment/572456ac-482f-48d1-86b1-db2a592f6908

When I remember that my 11 was able so last more than 2 days...

What model you have?

Hello OsY_1981,

This link will take you to the place you need to report phone issues, problems you are having with your device. This link IS monitored and recorded by Apple and all issues are addressed and reported to engineers for being addressed. This IS the one place that reports of issues are ALL read and taken seriously. With this battery issue, tell everyone to report it at this site. If enough reports are received Apple will address it.

https://www.apple.com/feedback/iphone.html

It is for sure not to demonstrate anymore but iOS 14.3 combined with the carrier firmware update didn't solve the issue.

I am using an iPhone 12 Pro Max, linked to a cellular Apple Watch, with dual SIM (both Orange) with data activated in 4G/LTE only on the eSIM. Yesterday, the day after my update to 14.3, my phone seemed to drain less than usual so I got some hope but finally not ... Here are my figures :

The phone was fully loaded yesterday at 8am, during night it drops from 105% (it has 200 mAh extra compared to design capacity) to 98%, which was not so bad for an iPhone 12. So I thought that they have maybe mitigated the issue in iOS 14.3.

So after having charged it to 100%, I used it all day long without plug it 1 sec. Uses are as below :

1. Moderate use in office, connected to WiFi, some texts, mails refresh every 15' or push for some accounts and a 5' phone call. So a very light use I would say... This was in Belgium and with LTE/4G.
2. Commuting back in taxi, then train and finally high speed train using texts, socials and medias. Still Belgium.
3. Still commuting but having some rest, in high speed train, listening music with Spotify (playlist in local and not streamed) and airpods. Mixed between Belgium and France
4. Back in France, texts again, reading news and with Uber app used for 30' in background.
5. Finally it is time to sleep, iPhone in idle from 0am sharp at 50%, absolutely no activity with do not disturb activated and sleep mode, so the screen shouldn't have been activated even once during the night... Wake up a 7am with only 32%.

So nothing is solved and as you can see, the slope is hardly less steep when the phone is idle than when it is in use.

I have some hope with the post below according to the post above about iOS 14.4.

But anyway I will return this device before the end of the return windows to get another with a new battery if the problem is finally fixed by iOS 14.4 or to go back on my 11 Pro Max without, almost, any regrets.

Another point guys

for those who have the issue in dual sim mode, have you noted if the drain is the same whatever the line on which the cellular (4g-5g, ....) is active? I noted that it happens only when cellular is activated on the e-sim line...another guy from China has likely the same issue as me....

https://discussions.apple.com/thread/252133060?login=true

Thanks