iPhone 12 battery draining fast

I'm still experiencing heavy battery drain on my 12 pro max. I switched off 5G and now the phone does not get as hot when charging (alway official Apple charger). But Im still experiencing 20% drain over 6-8 hour period without activity. Will bring it to Apple store in the next few days and we'll see what they say

From Toronto, Canada

1st Night:

When I upgraded to 14.2, I noticed a huge battery drain overnight on standby anywhere from 10%-20% on iPhone 12 Mini.

Upgraded to 14.3, and after one night it dropped only 5% in 7 hours of idleness (without wifi, only LTE).

Will see tonight whether it is the same case.

2nd Night:

After the 1st night, I thought the problem was gone, but it reared its ugly head again! This time to my dismayed it dropped 21% in 8 hours of idleness (same settings)!

Will see tonight whether it is the same case.

Dear All,

If it can help certain, I also encounter the effect of draining the battery, in standby or at night with a loss of 15 to 20%, I received my 12mini a week ago now and I noticed that from the first recharge. I tried like many to turn off what could be, notifications, activity background etc ... but to no avail. Last night I tested two new things, replacing the 5W iPhone charger to a 10W iPad charger and the second I turned off data analysis and sharing in the privacy / sharing and enhancements menu. The balance sheet 100% charge this morning after having a 6h30 of night not connected. Maybe a lead, I'll turn the data back on tonight to see if it discharges again and keep you posted.

the only thing that've changed was to manually switch from LTE to 3G and over the night even with turned on cellular data the battery drain was gone.. The only problem what i'm asking is there any option this to be fixed with software update?!

Ok 👍, it’s an another lead for Dev team Apple, I hope... I do not pretend to want or be able to fix this problem, it is just a personal observation that has allowed me, pending a future update, to limit the damage ...

I fully agree, I experienced the same this morning. My iPhone was plugged in until 0am and at 100%, I have unplugged it before to stop using it and I have found it a 98% this morning at 7:30am, I have read one page on this thread in dark room and I had already lost 2%. Since this moment, almost 2h later after having 4 texts and this picture below by mail I am already at 93% ...

As it has already been said a lot of time here, I suspect that the 100% last longer as the phone is new and the battery capacity is still higher than the one announces by design. So they are virtually at 102/103/104 or more % an it hides the drain by night. But as soon as you hit the 99%, the fall begins ...

I will let it on the desk as much as possible during the morning and see how is it before lunch, without too much hope.

Replacement iPhone 12 Pro Max

Night 7 Belt & braces approach. Backed up to iCloud and my MBP, updated to iOS 14.3 today, no carrier update.. Leave it manually selected on 4G, didn’t perform very well last night, draining 17% with 14.2.1 O2 setting 45.0

16-12-20 22:18 battery 93% left on 

17-12-20 09:00 battery 72%

iOS 14.3 no better for me 21% drain. Will manually select 3G and see how that goes tonight.

Night 8 Only change to leave manually selected on 3G

17-12-20 22:20 battery 90% left on & left alone.

18-12-20 09:08 battery 89%

That is what should be normal. Will have to leave manually selected on 3G till Apple get their act together and release a proper fix. Had so much stress because of this phone! They always seem to have problems because of the battery.

After updating to 14.3, I observed that the battery drain was still there and so I reset network settings. That's all. As to my brother, all he did was a reboot. Since then we've been experiencing fantastic battery. Also I set my network to LTE instead of 5G auto.

I honestly think it is another problem than the one talked about here, you should really return it asap to get a new one.

If it is still possible for you, you should even return it, ask for refund and buy a brand new one. Thus, you will avoid to have a "service device" which could be a refurbished one.

I was having the same issue - my battery was dead before noon several days ago and I assumed that I had failed to connect it fully to the cable when I went to bed. However, I subsequently noticed it draining completely within five hours despite minimal use. Upon installation of iOS 14.3, the problem resolved. I will watch it closely.

Here is what I get today with an iPhone 12 Pro Max unplugged since 0am last night and with a very low use in the office today : a few texts, a 15 min phone call, 15 photos, some messages on Microsoft Teams and of course the usual background activities and mail refresh.

I have to admit that it seems better than usual, I am still at 66% after 3h26 of screen on. I no longer know if it is normal figure or if my perception is altered by my previous figures which were worst with the iPhone 12. It is still not negligeable for a such moderate use I think.

I will not plug it this evening and see how much it looses this night, thus in order to not be fool by the "extra long 100%".

I should definitely use again my 11 Pro Max in a similar use to get an answer. I will do this next week after a finder's back-up restoration this week-end.

Same here. Battery is draining too fast. When apple will take an action about it?

few minutes here I’ve read a lot of comments facing the same issue.... and it is not isolated case. iPhone SE 20 also occurs the same

i upgraded from iPhone 11 to 12 and was shocked about battery life one night left 63% and when woke up phone was dead. i recalled what happened to my iPhone 8 when left with pay as go sim ,

Try to disable news and Live stock app in notification panel and make sure you iMessages have been activated on your number and not stuck at activation . it helps now my phone have longer battery life but not as good as iPhone 11 .

I guess I can approve kind of a solution which already has been mentioned here. So swtiching to 3G only, and turning notification and background refresh off of Facebook Messenger app does a good job.

And finally my results:

It drained 1% after 6 hours, which is pretty close to excellent.

I have this drain-on-idle issue on physical SIM (no eSIM or dual). As I understand, the issue affects only iPhone 12 (including pro and max) models, it has been present in all iOS 14.0-14.3 and some people reported 14.4 beta 1 has it fixed, but I personally haven’t tried it. I can confirm that switching “voice & data” from LTE to 3G slows the drain to an acceptable level.