iPhone 12 battery draining fast

This is disgusting...12 Pro Max!!! 1h 45m screen on time...29%. The rest is just idle drain. I also noticed that only 4 minutes on Safari was enough to drain it 2%! I even tried setting my network to manual which some suggested and it’s still draining as you can see above. If I’m having such a massive drain on the Pro Max I can only imagine the trashy performance on the smaller models with their even smaller batteries!

I did this experiment...has now passed 24h since i put the phone down and i only used it to check the battery and email entry, So, i have 28 minutes with screen on time and 46% battery...Please Apple !!! Don't tell me this is normal behaviour !!!

Here is my idle battery drain after 20 hours. iPhone 12 Mini, Dual sim, German carriers, o2 (physical) and Telekom (esim).

did the test after a factory reset with a restored backup. Wifi always on.

I was in a chat with Apple Support and they weren’t helpful at all. Gonna try out a call.

On the left side one night with eSIM Telekom Germany (Over 30% loss)

No 2nd physical SIM

WLAN off

EDIT: 5G off, LTE on

__________________________________________________________

eSIM Telekom turned off

2nd physical SIM NettoKOM (Telefonica)

5% over night

WLAN off

EDIT: 5G off, LTE on

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.

I think I have found a temporary fix.

Try to switch your non-data sim to 3G. Doing that by: Settings -> Cellular -> Cellular Plans (Select the sim you do not use for data) -> Voice & Data -> 3G.

After doing this I don't have issue with battery draining anymore.

I've included a screenshot of before and after the fix.

For anyone with this issue but not using dual sim, I don't really know what would fix your problem. But try to change from esim to physical sim etc ... Because I think it is very likely a software bug related to cellular plans, sims, modem.

I was experiencing the same thing on my 1 day old iPhone mini. I lost 35% of charge overnight. Then I limited my cellular connection to 3G/2G only. And it was much much better. I lost only 5% over the period of 8 hours.

Evgen_new wrote:

I can't say 100%, but according to reviews on this forum and other forums on the Internet, not all cellular providers have a problem.

Unfortunately, I can't check it myself, I have only one SIM provider.

We are here to find out and try to help each other.

On my side I am in France an with Orange as data provider. I have an eSIM for the personal line and a SIM for the professional one, both with Orange. The 12 Pro Max is under iOS 14.2

I had the same settings on my iPhone 11 Pro Max with iOS 14.2 and I didn't experience any issue.

I have even tried, before I get the 12 Pro Max, to not charge it during one night in order to see if I experienced the issues reported on this feed on my 11 Pro Max. No issue at all, he was at 100% in the morning.

I got the 12 Pro Max on Saturday, made the restoration via iCloud and wait for the photos sync to be ended before to conduct the same test on it during the last night.

I have compared it to my 11 Pro which has no more SIM or eSIM but it still connected to iCloud, synced and has therefore, theoretically, the same background activity as the 12 Pro Max.

You will maybe tell me that the results can't be the same as the 12 has SIM and cellular activity when the 11 hasn't, I would agree if the 12 wasn't connected to the WiFi and if WiFi calling wasn't activated on both SIM. As soon as it is activated, I assume that the cellular connexions are deactivated.

Here are the results ...

The 11 Pro max

The 12 Pro Max (which started the night at 88% and not 100%)

I am also having same issue on my iPhone 12 mini. In my last 16 days of possession, faced this issue twice. Happens at night.

Last night, slept with 50%, woke up after six hours at 10%. Horrible.

I always keep battery saving mode ON.

Apple support guys did battery health check and found everything OK.

They recommended to quit all apps and disconnect WiFi before sleeping.

This is a screenshot from iPhone 12 mini. I bought a phone for my wife and her phone also has a problem with fast battery drain. I read here that someone turned off the 4G network and the problem lost its fast consumption! Good! Approximately 18 hours have pas sed since the last charge, and there is still 36%. I think this is an excellent result considering the size of the phone. I have a iPhone 12, this problem not found.

i shifted from iphone 12 to pro max, thought I had a defective unit. To see I’m facing the same issue on the 12 pro max too.

losing 10-15% overnight with WiFi only turned on. Cellular data off/ Bluetooth off.

tried all battery saving tips. I’m in no 5g area, so can’t even see option of turning on 5g

battery drain overnight is constant even with battery save mode on.

also I have noticed battery is draining over the day when in idle about 2% per hour.

nothing seems to fix this issue for me even changing units,Apple needs to acknowledge this issue and come up with a fix.

So...with “Remote Control 2” version installed, in the morning everything looked better...but during the rest of the day, everything went back to "normal" drain, loosing battery on standby like before.

In the graph you can see i only had a total of 1h41m with screen on time and lost 50% of battery with notifications off.

I think i am going back to my old 5S, that machine does one remarkable thing... DOESN'T LOOSE A STUPID AMOUNT OF BATTERY ON STANDBY !!! Seriously Apple ???

I guess same goes with iphone 12 mini as well! Battery is draining much faster even without 5G.

Looks like a bad buy even considering that battery is smaller in mini.

Is there way around?? Its disappointing to have such experience

I use single sim and the same issue, it happens randomly like 2-3x per week,

Last night i charged it to 80%, iPhone 12 Pro Mx, iOS 14.2.1, Wifi - off, Data - Off, Bluetooth - Off, Single sim and next day at 11:00 battery lvl at 40%, on the battery graph you can see no any activity since was charged, This is very very bad, i can starting to charge it again at the morning which is bullshit,

Same here on the standby drain.

However, think I found something interesting. I've 2 SIMs at the same time and they're both non-5G ones and are both on the same Belgian mobile operator.

After reading something in a French forum, I decided to disable one of them (the primary physical one) and guess what: drain has stopped ! You can see it in the graph when the battery level goes from diagonal to horizontal. I've also disable mobile data since the 2nd SIM has a very low data allowance included with it. All these tests were done when connected to WIFI all the time.

I'm now doing the same with the eSIM one and report back with the results. The small dip that you see at the end of the slope is when I did the switch but I left the mobile data on this time. I then switched off to be in the same case as before. When I have some data to report, I'll do so.

On the fence to install 14.3 beta since I've also heard some feedback that it solved the issue.