iPhone 12 battery draining fast

Hi, have battery issue on two new iPhone 12 Pro, bought just before Christmas. Both on O2 network sim.

have others confirmed that it is related to O2?

have you proven that the next version from IOS 14.3 fixes it ?

we get about 20% battery drain overnight even with WiFi, mobile data and Bluetooth all off.

if flight mode selected, battery drain is about 1%

Hi guys, I also noticed this problem since I started using my iPhone 12 Pro (on day one). With my previous XS it never happened. I'm attaching my screenshots as well:

And here is the battery health:

I have dual SIM setup with 5G off (since it can't be turned on with dual SIM), and only one data plan with auto switch off. Still, as many users reported, even turning data and wifi off for testing purpose wouldn't solve the issue: the battery would still drain as before.

It looks like the drain is independent to the utilization that could hopefully be solved via software update, but I found this behaviour only on 12 PRO despite having other models like X and XS on the same OS version that work fine.

It would be nice to have some words from Apple itself on this phenomenon.

Went back to an 11 pro max. I will report how the phone acts on 14.3 as compared to my 12 max. I will say that with sim disabled and some minor FB scrolling on WiFi I lost 6% battery in maybe 30 mins.

Looking forward to seeing if the 11 pro max still acts normally. I will say I miss the size of this phone. Feels much smaller than the 12 pro max in hand even w a case on. I’m still leaning towards apple having a major issue with the 12’s as I’ve had two and both had terrible battery life under basic usage.

Is this with your iPhone 11 and 12 on the same iOS version? So both 14.x?

This is the real question because to me it is unclear whether this idle drain is specific to the iPhone 12 or rather a general issue of iOS 14.

Thanks

I switched my carrier from Vodafone Germany to Telekom Germany 1 month after receiving my iPhone 12 mini.

I experienced higher drains over night with Telekom, yet still not consistent (varying between 10 and 35% per 8 hours; but never less than 10% over night).

Before I did not notice that much of a drain.

Had a chat with Apple service but they state everything is okay... Quite frustrating.

I also noticed that after updating to iOS14 my iPad Air 2 loses ~7% at night, but only between 0 and 1am, not constantly like the iPhone.

I doubt that phone replacement will make any difference. It’ll come with the same modem. It might have been a change on your network provider’s side which triggered the drain.

I recently switched from EE to O2 because it provides better indoor reception in my area. I had no drain with EE (even though I only had one bar indoors). With O2 I have five bars indoors, but now I have battery drain which I can only stop in airplane mode or occasionally by switching to 3G (O2 still has 3G option). I might have to switch back to EE now 😂

So, it’s not just the signal strength that matters. Looks like all iPhone 12 modems have the same fault which causes battery drain with certain network configuration in place.

Only Apple can fix it with software update (hopefully).

Currently at the same stage with Apple Support. They've asked me to factory reset and setup as new iPhone. I am a 100% sure that this wont resolve the issue but following protocol as they keep saying they would like to isolate the issue. Afaik, its either a hardware or software issue related to the cellular/mobile data options where I was able to isolate the issue.

Still spending time with Apple support to get their awareness to that is where the issue lies.

I have done the factory reset and set it up as new phone without down loading any apps I lost 13% overnight,contacted apple again for the fourth time,they asked me to contact them again after a week since I have got little bit better they are saying it’s a good sign and it may get better,I am not convinced once downloaded all the apps it is going to be the same my what I read between lines is they are working on it it might solve with next iOS update though they haven’t said that,when asked they say it is possible ...anyway I am not going to give up will contact them again in a week

I installed gmail app day before yesterday. Suddenly, I lost 10% over night. Then I removed the app. It was fine. However I don’t have overnight drain problem since day 1. I have a severe battery drain during normal usage. Losing 50% in 3 hrs 30 min for normal browsing and WhatsApp chat. (Not audio or video calls). Definitely 12 series got issue

Add me to the list. Got my 12 Mini on Jan. 5, got it set up from my XR backup. Charged it to 100% before going to bed. It lost 32% in about six hours. I thought it was due to the phone being new and running background processes. Jan. 6 charged to 100%, but this time I turned off background processes for a lot of apps which shouldn't need it. A lot of good that did because on night two it lost a whopping 62% in six hours!

I've read through this and other threads and read the usual useless motions Apple support suggests. This goes back to the first deliveries in October. My XR was on 14.3 and had no battery problems at all. Fortunately I've still got it and am in the return period for the 12 Mini. I'll give it a few more days, but based on months-long experience of other owners it's not looking good.

I just bought iphone 12 pro 2 days ago. I observed the same issue with battery drain. I put my iPhone 12 pro in airplane mode with just wifi on. In 1.5 hours, it drained from 84% to 78%. When I checked my batter usage, it showed 0 screen time and no app was used (not even in background). Still it got drained by 6%.

I have iPhone 7 which I am using for 4 years now with 67% of battery health, and I did the same experiment (putting in airplane mode and only wifi on). Surprisingly, iPhone 7 was discharge by 2%.

I am going to call Apple regarding this. There may be a battery issue or bug in the iOS. Paying $1100 for this device is a shocker. Apple should now concentrate on performance and iOS rather than just design and colors. Other competitors will outsmart the iPhone in coming years if Apple remains conservative.

Good luck Apple!

The drain has been really bad for me the last days, and when looking at the battery usage / graph thre is nothing that can explain the huge drain. I have everything turned off regarding background app refresh and things like that so nothing is running, and all apps closed, still some nights when the phone has been charged to 100% and I go to sleep after, then when waking up the phone will be at 70% sometimes. So a 30% drop overnight without being used or anything running on it. The phone is always on wifi when at home. Maybe it has something to do with the modem like some of you suggest, but for me it wasnt this bad in the beginning when I first got the phone, it would still be at maybe 100% when waking up or maybe at 98-99.

in my case, i am getting ok idle drainage, maybe 10 % percent per night. But these 12’s suffer from erratic battery behaviour, never experienced on any iPhone before. They lose way too much battery with light usage. Sometimes you just check email, whoops battery loses 1-2%. You take four photos, battery loses 4%. 1 hour pool 8 battery loses 12% ( which is ok ) but then phone magically loses an addition 5% minutes on idle thereafter. This is not normal and the there is something fundamentally wrong with the 12’s. I think iOS 14 is a battery hog in general which further compounds the problem. Thank you apple for providing us with a 1300 euro POS mobile this year with an even greater POS modem. It can have the best camera ( which it does ) and lidar and this and that , all cool stuff, but fundamentally this is a MOBILE PHONE, and battery is fundamental on a mobile phone.

Same problem with my iPhone 12 Pro since the last update. Battery life was cut by nearly half due to idle drain despite having background app refresh off, being on Wi-Fi 95% of the day and no IG or FB installed.

Over night, in 10 hours time just being idle, everything off like background tasks and Siri, latest ios and modemsoftware (can not discuss the very latest here) and 40% drain being idle.

Seems hardware to me...