iPhone 12 battery draining fast

I don't have a 5G network, only 4G (LTE) or 3G.

Turning off cellular data completely did not completely solve the problem with fast battery drain.

Discharge per night in standby mode 5-7%

And turning on the power saving mode increases the discharge.

🤔 just a thought as I read here often of people who use such companies. If you’re on Congstar, they don’t offer 5G. Is it possible that there is somehow a connection problem between the modem firmware and the carriers service? Of course you don’t have to turn on 5G but I’m just wondering if this could be a problem caused by the firmware, even when 5G is turned off?

my Telekom eSIM (contract with 5G) is working fine. My Vodafone sim and my new WindTre sim don’t include 5G. The latter does domestic but not while in roaming where I’m in currently. Both show the abnormal battery drain.

I know I’m shooting in the dark...just trying to make some sense of this odd situation.

I am facing a similar issue on my iPhone 12. With literally zero usage at night and no background activity, i am losing 30% battery life at a minimum. This is the case every night and when I visited the apple service Center, they asked me to use the phone for few more weeks and come back again if the issue continues. Their response was that the phone is learning on charge cycles. I have been an iPhone user from years now and have used almost all models but never had such issues.

To be very frank a company looks at issue with issue is reported by by half the number for sales for example the screen flickering green tint screen with 14.2.1 update. With the battery the diagnostic it going to pass. As per the screenshot being 30% on messenger is impossible as 30% is more than 2 hrs of time spent on messenger. Especially social apps keep refreshing the apps on the background even if you disable background refresh. PLease enable background refresh and then manually turn the background refresh for individual apps.

Believe me, this ist really good and nothing to complain about. Here the issue is that the battery draining idle is about 5% to 10%/hr. People would dream about your “battery drain”. I believe your iPhone is perfect. Every smartphone consumes battery even in idle.

Turned on Airplane Mode but with WiFi and Bluetooth ON on my 12 Pro Max last night and instead of losing 15-20% battery it lost less than 5% battery...it still lost battery though (roughly 3-4%). Funnily enough, the 11 Pro Max with Airplane Mode OFF and WiFi and Bluetooth ON lost even less battery...just 2%. So basically the 12 Pro Max loses MORE battery in airplane mode than the 11 Pro Max loses without it. This hints that maybe the issue isn’t solely isolated to the new modem in the 12 series but might also be something else to blame as well. Whatever it is Apple better fix it because when I spoke to them the other day they were absolutely oblivious to the issue claiming my device was healthy and that they hadn’t heard of any issues like it...I mentioned this thread and they just dismissed me entirely.

One of the most likely reasons is that our modems work with operator base stations (in my case it is LTE network) change of your location showed different behavior, most likely if there is one stable station nearby, the phone behaves stably if there are a lot of them nearby the phone is constantly looking for and changing them from this and high power consumption in idle mode.

Here's a short test I just did:

3g cellular data

No WiFi

20% brightness

Scrolling posts in Instagram in the "Explore" section.

Lost 2% for 9:30 minutes.

I don't know if I should consider this normal, but it looks pretty ok to me.

I think it’s important to also clarify that it’s not just standby drain that’s an issue but also abnormal drop in percentage when in use. I fully charged both 12 Pro Max and 11 Pro Max to 100% and squeezed close to an hour of social media into the 11 Pro Max before it started dropping in percentage...2 hours later it was still above 90%. Meanwhile the exact same on the 12 Pro max saw it starting to drop after just 5-10 minutes and less than an hour later it hit 90%.

Considering apple advertise THE SAME battery life on 12 Pro Max to 11 Pro Max (both tests were done over WiFi with 4G...no 5G...) it’s shocking really. The other day I had less than 2 hours screen on time before the 12 pro max hit 29%. About 20-30% of the drain was actual usage and the rest was idle drain.

EDIT: just typing this comment took 2% of my battery! Honestly it’s shocking!

For what it is worth, my iPad Pro 9.7in Wifi only is on 14.2 and has no battery drain. Upgraded my 6S Plus to 14.2 and getting battery drain. In fact turned it off last night, turned it on this morning and the charge was still there, put it down, checked a couple of minutes later and it had dropped 5%

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.

Being very disappointed with my iPhone 12... being loosing a lot of battery on standby, every time i touch the screen to check a notification or the time i loose 1%. With only 1h35m with on screen time i lost 60%. This has to be acknowledged by Apple and not being taken as a "normal" behaviour.

I can improve the situation a lot by changing the "network selection" from "auto" to my actual provider (I can select between three) to an extent where I am no longer sure if there is even an issue afterwards (there is still some battery drain but that could just be normal) but the battery consumption is even better when I disable the mobile connection altogether and just use Wi-Fi (including Wi-Fi calling). Then idle battery consumption is really good.

So, my conclusion is: It is definitely related to the mobile connection (irrespective of data usage). It also seems to have to do with the network provider(s) somehow. Either the phone juggles between different network providers all the time causing the battery drain or some specific providers are triggering this issue.

I'm pretty hopeful that this gets fixed with a simple software update.

So I conducted another observation/test last night of my pacific blue and my brother's graphite. Both charged to 100% by 9pm.

From 9pm to 7am, an 11-hour standby and the result shocked me cuz I thought they performed the same yesterday for 24 hours.

Pacific Blue - 100% to 84%

Graphite - 100% to 100%

I’m astonished to hear that Apple support staff actually suggested you to quit all apps and turning off wifi before you put your iPhone 12 mini on idle overnight.

I don’t think I even need to do that with an iPhone 4.

The iPhone 12s are NOT cheap, I’d feel pathetic to use such an expensive device bought by good money, and having to turn off wifi, use 2G, run barely no Apps, as if I’m using a piece of 10 year old junk.