iPhone 12 battery draining fast

I feel your pain. My replacement phone was the same. Also using a Vodaphone UK SIM. 4g. We are going to have to use Airplane mode when in the house if we want the phones to last a respectable time until Apple come up with a software fix. Too bad I sold my old iPhone 7 Plus to get this. I kind of wish I hadn't but I do think Apple will resolve or we will just have to change carrier. If you do a google search, there are at least 4 articles that are quoting from this thread therefore the issue is now in the public eye, as more phones are sold, more people will come forward therefore Apple will have to address. We are the small number of users that keep an eye on battery and do not charge overnight everyday therefore some will have the issue but just haven't noticed. Other users who are on different carriers, have different network variables seem not to be getting the issue.

Same issue with my iPhone 12, 128GB mini (screenshot). Workaround is airplane mode or power safe mode(less draining). A real solution=switching carrier but you will need to test if it will work for you. For me I cannot switch for now due to contract regulations and fixing it, physically removing SIM is like going back to my iPod days. I feel it can be fixed either by carrier or by Apple with an iOS fix keeping the SIM at sleep at night while not using the phone instead of pretending to be Father Christmas jumping from chimney to chimney draining the battery. Let’s hope Xmas will be kind to iPhone users.

I did that few days ago along with many other things so I wasn’t sure if that was the reason alone but it helped. The only widgets I kept are the ones from photos and music app, I moved weather, calendar and few other widgets which require network to the left. So far no battery drain.

But still, why do I have to disable all the services to achieve somewhat decent battery life?

I’ve got EE eSim and it was still draining up to 15% overnight. In dual sim mode with O2 as a physical sim, it was more than 20% overnight.

I basically turned off all services I could, removed widgets, signed out and signed into iCloud and then I got around 5% overnight. This is not normal but bearable until they fix it.

Hey, guys, in general, seem to have solved the problem. If you manually turn off WI-FI for the night (so that it does not turn on at 5 am), manually Bluetooth, a 3G network only (Surfing is no different from LTE), as well as manual network selection, instead of automatic. In general, it does not eat up in the background and keeps it normally during the day. The Apple Watch is connected all day, + sometimes headphones via Bluetooth.

So I had the opportunity to test two iPhone 12 Pro Max for 24 hours. My brother was kind enough to lend his graphite Max.

Both phones have same set up. Same postpaid lines under the same carrier. Mine is connected to my Apple Watch. Wifi turned off in both. Here’s the result.

Pacific Blue

7pm - 61%

5:30am - 56%

8:30am - 53%

11:30am - 51%

2:30pm - 47%

7pm - 39%

Total battery percentage lost - 22%

Graphite

7pm - 52%

5:30am - 48%

8:30am - 45%

11:30am - 44%

2:30pm - 39%

7pm - 32%

Total battery percentage lost - 20%

I think a 20% battery drain after 24 hours on standby is not acceptable compared to the 6-10% battery drain of my 11 Pro Max on standby for 24 hours.

I was hesitant to make time and contact apple support but today I did through chat.

I intentionally contacted them and pointed this apple discussion as we as informed them about all the media reports of this issue, so we make more data of reporting the issue directly to them. They refuse to answer questions and give opinions when I kept bringing how many people complain about this online. Next they ran diagnostics on my device and said everything is ok with exclamation mark so happy lol, then advised me to bring my phone to store for inspection by engineers when I kept moaning about the broader issue. I already told them people from here had several replacements and still have the battery drain issue so this isn't going to help either. It's a matter of luck and throwing the dice to get a good device replacement and then one god knows how many days it's going to be OK until the issue appears again.

I tried to push this and get seniors or higher management escalation with the only intention to again point this topic and all the media attention around this. I know well that regardless of the time spent with the support my phone isn't going to be magically fixed of this issue. I'm just doing it for the good of all of us so this gets more attention.

I managed to get a senior agent escalation. They ran diagnostics again but this time the agent said it's for the hardware, and asked me to send them screenshot of my battery usage for past 24 hours and past 10 days. They said the device passed the test for all sensors and that for the battery health check and in this case it means that it's a software issue, which they will escalate above for further investigation. They saw from the hardware diagnostic test that my battery for the past 24 hours on 10th December dropped significantly when the device was not in use and doesn't show an app in use during that time as well. This is shocking!

The senior agent just closed my case at the end and just advised me to call the support by phone with my case number so continue troubleshooting lol. I'll dial them later today to see what's gonna happen and I'll update.

In my tests I figured out that the problem clearly has to do with bad reception. I usually have only 1 to 2 bars in my apartment but tonight I slept at a place with good deception (5 bars). The result: My iPhone 12 lost 5% during the night (43% to 38%). In my apartment it‘s usually 25-30%. My old Android Phone always had good reception in my apartment. So the only workaround is using airplane mode, which sadly isn‘t possible during the day.

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

i think the mystery is resolved ..... i switched off the cellular data last night , only connected to wifi .....0 percent drain

i have already returned 12 pro but the pro max also didnt turn out different .......bettry drain starts while connected to cellular data .

i will switch on cellular tonigh and would share tomorrow

In my case the carrier update was not included and has to be done separately from settings/general/informations and there it is proposed.

And even with the carrier update, issue seems not to be solve but only slightly reduced ...

I will make a new test during the coming night.

Hi,

I didn’t get a prompt to update my carrier settings for Sky as others with a different carrier have.

I noticed that mine had been updated to 45.0 whereas my wife (who has not upgraaded to 14.3 yet) is on 44.0.

Just go to settings > about > carrier and see what version you are on.

I also redownloaded my carrier settings from Sky Mobile

I've tried switching manually 3g and it was working for me.

I was having the same issues and immediately when i've switched to 3g the battery drain gone. You can check my comment above i've share a screenshots also what was happen.

Best Regards!

Hi,

I had the same issues as you with my iPhone 12 Pro. Battery went from 100% to 70% overnight (7hrs). Thats why I asked Apple for a new phone. No problem whatsoever, they sent me a new phone immediately. At first I was happy that everything went well, but eventually the new phone had the same issue... battery drain overnight, too much of a problem for a 1200€ phone. That’s why i asked for a refund and see if they’re going to fix it in the near future and maybe buy it later

As I told, I have restored my previous iPhone 11 Pro Max (from a finder back up of my 12 Pro Max) in order to make a real comparison between both battery performances and drains under iOS 14.3

So here is the values for a 11 Pro Max with dual sim Orange and with WiFi, Bluetooth and apps background refresh activated. Just as everybody should use and enjoy its iPhone actually ;)

It has been use moderately at office during the day, not connected to WiFi until from 4pm but it seems to have no impact, and then a little bit more at home with a phonecall of almost 1h on WiFi Calls with Airpods used.

It wasn't the same say but here is how the 12 Pro Max under iOS 14.3 performed in a similar use (moderate at office) in the circled area, even if it was less light than above according to the diagram ...

Back to yesterday, over the same period here is how the iPhone 12 Pro Max behaves with the same settings, except dual Sim of course

After one night, here is the 11 Pro Max (left at 67% at 10:45pm and find at 60% at 7:30am) which depletes at approximately 2.5% each 3 hours in the beginning and then 2%:

Here is the 12 Pro Max over the same period which depletes at approximately 1.5% each 3 hours constantly:

As a comparison, the last one ;) , there is how the 11 Pro Max depleted just after the activation of the 12 Pro Max in the same conditions (still configured but without SIMs) at approximately 2% each 3 hours constantly:

In my remembers, the iPhone 11 Pro depleted slowly than the 12 Pro Max, especially from 100% but they seem comparable here. Strange ... I will observe it a few days more and keep you posted.