iPhone 12 battery draining fast

Hi all,


Trying to work out if I have a defective unit I need to send back or if there's a wider issue here. The iPhone 12 Pro is advertised as having a smaller battery than the iPhone 11 Pro so I expected to have slightly reduced battery life (which is fine as 11 Pro was excellent).


However I'm noticing that the iPhone 12 Pro is draining when idle with almost no background activity at a rate of 4% which is much faster than my previous iPhone 11 Pro, and to be honest a faster idle drain than I can actually remember from a new iPhone. First instinct was to disable Mobile data to see if it was a 5G thing, but I actually don't see any real difference from doing that (which makes sense as I've been on Wifi 98% of the time since I got it).


No matter what I try, it seems to be going down oddly quick. Not to an useable level or anything world ending, but I guess its sort of suspicious. I check the battery report, and it's not showing any real culprit, just a rapid decline for no clear reason.


If anyone can share their idle battery with either 12 or 12 Pro I'd really appreciate it.



[Re-Titled by Moderator]

iPhone 12 Pro, iOS 14

Posted on Oct 25, 2020 8:14 AM

Reply
Question marked as Top-ranking reply

Posted on Jan 1, 2021 5:25 AM

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.


  • Location Services > System Services. Be bold and turn off EVERYTHING. Toggle the status bar icon (the switch on the very bottom) so when you slowly enable them one by one again, you can keep an eye on what triggers the location to update. With the status bar icon on, you can check and investigate closely how and when a certain service is updating. I found the Find my iPhone location feature updates like crazy.

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).


  • Put Bluetooth into standby so it stops searching for new devices (Toggle it via Control Center so the icon becomes white.)


  • Turn off 'Ask to Join Networks' and set 'Auto-join Hotspot' to Never in Wi-Fi settings to stop the device from constantly checking for sources, notifying you and trying to connect to other routers.


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.



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2,818 replies

Aug 6, 2021 9:11 AM in response to LSN9

well first Verizon, gave me a new iPhone 12/pro but the same thing happened and I had only one return so I know that I did not only get a lemon at least. Now I am working with Apple support. The engineers look at my 24 hr logs n blamed google apps. I deleted them and still a issue. Waiting for response. I am fed up n just will charge everyday even with no use. I believe that this is not only a software issue but hardware n 5G thing

Aug 9, 2021 5:25 PM in response to Master26A

My wife and I traded our old iPhones in a few days ago and this is happening to both of us. She went from an 11 to 12 pro. I went from 11 pro to 12 pro. My 11 pro was at 80% battery health and it far out lasted my new 12 pro. I’m referring to the phone when it’s idle only. This makes no sense. Is there a solution? I tried Turing off 5G. No luck. Extremely annoyed. I woke up this morning fully charged. Laid my phone down on my desk, and within 2 hours at my first check I was at 93%. How does it lose 3% per hour idle? Config is identical to 11 pro and my old phone would maybe lose 10% over an entire night idle. This one pushes 25% loss in the same time frame.

Aug 11, 2021 2:01 PM in response to maikm23

Just got off the phone with a second-tier support representative who communicate with the engineer about my analysis of 100 to 1 percent experiment and its logs for 24 hours . They wanted me to fully charge my phone and then use it til 1-2 percent left n then they would collect the 24 hr percentage chart with detail of usage. One time, I let my phone be idle a lot with only 4hrs use total within drain of 2.5 days n they said normal. Then I did it again with FaceTime ,phone use, and google search and with 1.5 day a total 6.5 hrs and they said good . What is normal battery usage time? If someone is on zoom n phone with this data , the phone would not last even a full work day. My friend’s 11 pro does not move a lot during no use so she get several days before charging. Should I put it in for hardware service ? Any suggestions? I spent so much money on this phone!



Aug 17, 2021 8:42 AM in response to maikm23

I don’t agree with this because Verizon gave me a new phone and the same problem happened. People don’t care because with MagSafe , everyone is just charging their phone. Both of my friends say they don’t care because they charge their phone throughout the day n don’t care about battery drain. My friend’s phone gets hot sometimes as well like mine, the more you use it less idle time so don’t see the drain . Anyways, I have given up and joining the 99 % apathetic consumers . I am tired and Apple will not admit that there is a fundamental problem with the Iphone12 series.

Sep 1, 2021 8:18 AM in response to Rene1fr

Hi, your extremely right the battery is horrible on a few devices but not all. I too am one of those people who is facing these issues. I visited another service centre and they said they cannot open the device and examine the hardware until any issue reflects in the the tests they conduct. The tests have been done multiple times on my phone but it doesn’t reflect anything as such. So there’s no point of visiting a service centre or even contacting apple support. If you call apple support then they say go to the service centre and vice versa. Apple is just charging funds and providing paper weight to their customers. At the end we’re the ones losing out as we have paid huge funds and are given crap in our hands. Here in India there’s no importance given to consumer rights. If it was than people could have even sued apple misleading customers. Please do not waste any time with the employees at service centres or on a call with apple support. The end result is always going to be fail and that is the reality. If any of you’ll can go ahead and fight against apple for this mess they have created then please go ahead.

Sep 16, 2021 12:50 AM in response to Maximilian_1991

Apple tells me that 12 pro should get about 10 hours of screen on time between charges. My use everyday is just whatsapp, safari and a few calls coming upto maybe 2.5-3 hours max per day. Apple says that these apps are causing significant drain on my phone. What the **** does this mean. These are the basic apps that everyone uses and if not this then how the hello can you say that phone can last 10 hours. Apple’s employees heads are empty just like you’ve heard empty vessels make the most noise. They just wanna try and divert the matter. Mother fcukers

Sep 19, 2021 5:09 AM in response to user0197

I can't find anything specific in my contract and in my online portal and website of my provider. But I'm still having contact with Apple Support and they just don't know it anymore, they also advised to call my provider and check if anything changed.

So I'm gonna do that tomorrow, but on the 13th of October my new eSIM contract will activate but I still hope it's a configuration on their side or something because I had a good deal with this provider and I prefer to keep it, but not with this drain of course.

One thing is for sure, Apple Support can't and won't fix it, because the only thing they can do is advice you to reinstall your phone or send your phone for repair. Which I both did.

But whatever, lets focus on finding a solution, I hope I have an answer from my provider tomorrow.

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iPhone 12 battery draining fast

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