iPhone 12 battery draining fast

In german Apple community some guys with Same Problems installed 14.3 Beta and they fixed the Problem. There is a new Modem Firmware and a new carrier Version for Telekom.... But i wait for original iOS. I am in fear too lose everything...

I think the best option now is to switch to 3G and wait for a software update. I was hoping for one this week but Apple staff are on holiday for Thanksgiving. So maybe next week we may have a fix. For those that can’t switch to 3G I’m not sure what to suggest for you guys. I’m thinking of installing the beta. I have installed betas in the past n other things broke. So I’m in 2 minds.

I can‘t Switch to 3G. LTE is slowest i can choose :-|

And Beta? I don‘t know... if i install Beta 14.3, can i overwrite it with the official?

i think my Option is too wait and make Air Plane Mode in the Night...

How good is your cellular signal at home? I've seen some messages where people compare their iPhone 12 with 11. Do both display the same signal strength or is iPhone 12's signal weaker? My iPhone 12 shows 2 out of 4, which I thought was OK, until i opened a "field test" mode. It shows that my RSRP is -110 dB which is accordingly to internet is very poor.

It would be an interesting information what your signal strength is.

I might try this. I have actually tried everything. Airplane mode still has more drain than it should do (i.e. 1% an hour as opposed to 3-4%), so theory it's only linked to the cellular network, im not sure is 100% true although that does make the issue worse.

Perhaps some batteries arrive in a slightly different condition. Optimised charging only kicks after several days and given our devices are just a few days old and have always suffered this i'm not too sure. I will certainly try what you have suggested.

I have been left frustrated by this issue for a few days now and after a call with Apple today, I have decided to try a replacement which I hope to get next week.

As I said earlier, my wife has the exact same phone other than the colour and network. She does not have any battery drain issue. Her phone is still on optimised charging.

We can speculate all we want, software is infinitely complex, no doubt its a superb phone without this drain issue, which does not only affect it in idle but actually during day to day use as well. Not many people have mentioned that.

Same here... Switched from an iPhone 11 Pro to an iPhone 12 Pro, and my battery loses about 20% overnight while completely idle. The iPhone 11 Pro lost about 3-5 % overnight, insane increase of battery drain.

I'm not sure about that. I have been doing a lot of testing on this issue and I have managed to isolate the issue to carrier in the current location where the phone is (my house).

I was getting 3% battery drain on a vodaphone SIM on idle all day and night. I have just switched to an EE SIM. Drain is now 1% or less every 2 hours with no use, this is now what I consider normal.

I am now sure this is to do with carrier (it could be localised i.e. carrier based on which mast you are hitting where the phone currently is) which is why Airplane mode seems to slow the drain down significantly as does removing the SIM.

I am due to get a replacement next week but I think if the next IOS update does not sort this, I will have to switch networks from Vodaphone to someone else, probably EE.

Got my 4th and probably last 12 Pro Max replacement on the 25th and the battery on this one has been impressive.

25th at night - 58%

26th morning - 54%

26th at night - 98%

27th morning - 95%

27th at night - 67%

28th morning - 63%

28th at night - 92%

29th morning - 89%

As I had mentioned earlier I did a restore but I had set up a new, just to be sure. This fixed it for me. A whole new eSIM profile got downloaded so I’m not sure it was the restore or new eSIM profile what fixed it. Apple support is really not much help even escalation did not get me any further dealing with the dual sim issue that still persists.

my solution is to carry two phones again until this modem issue get fixed. bummer, for such a pricey phone.

Something really strange I have learned regarding my battery drain issue:

The drain stops when I disconnect my iPhone 12 Pro from my Wifi network! On one night, I only disabled "mobile data", but the drain continued (20-30%). On the other night, I only disabled Wifi, and the drain stoped (only 3-5%) . I have reproduced this strange behavior for four nights in a row. I seems that there is some device on my network that keeps the iPhone "busy". I have an iPad, an iMac with Big Sur, an Apple TV and a HomePod connected to my Wifi network.

Is anyone experiencing the same behavior?

Thanks and kind regards!

Yep, think others have put into aircraft mode which stopped the drain....might as well say turn the phone off to be honest. Don’t know why Apple can’t just own it, be honest and say yes there’s a problem, we’re working to fix it. This whole experience has been quite traumatic.

i have had this problem since day 1 as I pre ordered the iPhone 12 pro, my device is unlocked and on iOS 14.2.1 . I have been through Apple support who did diagnostics on the device and said everything was fine, frustratingly I knew there wasn’t. I used a sim only deal on the uk on Vodafone until last night where I switched my sim deal to EE. I don’t like to switch off features of the device for which I’ve paid a lot of money for, I’ve tried everything in this thread including full phone resets using iTunes which was advised by Apple support... but did not make any difference. Anyway back to the carrier, I switched to EE, and my first night had 3% drain overnight from 15-30%. Now obviously this is only the first night yeah, but literally I have not had a single good nights battery life since using my Vodafone sim. It appears to be something to do with the networks aren’t optimised for the new modems in the iPhones. I had much better signal on the Vodafone network, I knew this would be the case as my fiancé is on EE and we don’t receive the strongest signal in our house. The reason I switched to EE is I read from a couple of people in this lengthy thread that they also switched to EE and the battery drain stopped. Fingers crossed I get the same results tonight also, I’m confident I will. I use a single physical sim FYI.

No drain in airplane mode, but also when only wlan and mobile data are switched off. Draining begins when wlan or mobile data or both are switched on.

Resetting of network, new installation with finder and setup as new, iOS 14.3 public beta, exchange of the iPhone to a new one, exchange physical to esim (German network Telekom), all that does not help.

Good luck with that. I got mine 9 days ago. Battery was stable for 9 days until now. The 10-15% battery drain overnight and during daytime while on idle is also affecting this new unit as well. This is my 4th replacement cuz of the battery issue.

I tried charging with both an Anker wireless charger and the official Apple USB-C charger - made no difference to the drain rate for me, and to be honest, I can't see how it could. The only difference the charger will make is it will shorten the overall run time if it isn't charging fully, as a poor connection on a wireless charger could do - it won't affect the power drain.