iPhone 12 battery draining fast

I had the same issue. During the night from 78% to 0% until the next morning. No apps were running, no background activity at least nothing shown in the battery monitoring. But it has happened just one time so far. iPhone 12 pro, 10 days old. No 5G, no dual sim.

I am experiencing this same issue on my month-old 12 Pro after updating to 14.1.2. A hard restart helped a little bit (bottom graph shows slight improvement with some plateaus), but after 2 days it's draining quickly again.

Vargstein wrote:

changing the network manually fixed my problem.

I also tried setting the network provider manually, her is the result:

At 21:28 I switched the network provider from auto to Telekom (Germany). After that the battery level went down from 88% to 81% in 8 hours. That are numbers which are ok for me.

iPhone 12 discharge 25% per night. iPhone 12 mini - 30% per night. Reset network, device, restore from TM or setting like new NOT help. 14.2.1 not help. Last beta 3 14.3 discharge 24% tonight. Disable wifi or bt not help.

This battery life (12 Pro Max) is absolutely disgusting. Last charged to 100% 24 hours ago (09:06 yesterday...it’s now 09:04 today). Total of just under 2 hours screen on time in last 24 hours. Battery is down to 58%. On the PRO MAX! The old 11 Pro Max, which is advertised as having the same battery life as the 12 Pro Max, would have over 80% left with the same usage! Needless to say...it’s setup exactly the same as the 11 Pro Max! And on WiFi with 4G (not even 5G). Vodafone UK Single physical SIM.

So I've tested latest 14.3-3 build and unfortunately nothing has changed so far. I give up and go for refund. Don't want to guess if this is a software problem which will be fixed in the nearest future or something related to hardware. Very disappointed, as this type of problems is something you can expect from, like, $100 phone, and not from the device which costs up to $1500 in the US and even more in other countries.

I would be very careful on deciding if to buy iPhone from the future 13 lineup.

Update from 12/04/2020

Switching from 4G (LTE) to 3G in the settings did not completely solve the problem, but the battery consumption per night dropped to 5% in standby mode.

I will be testing with my cellular data disabled.

It seems that an ios 14.3 fixed a drain problem for me. No airplane and low power mods. On the stable ios 14 I was only able to achieve a battery life like this with the airplane mode on. Will post another results in a couple of days.

I still can't understand the logic of the drain ? I thought I tried all the options to test the device in the last month ... the only thing I had to do was stay in 3G networks. Yesterday, I chose another carrier instead of my base carrier and installed its e-sim ...and

Same issue with my iPhone 12, 128GB mini (screenshot). Workaround is airplane mode or power safe mode(less draining). A real solution=switching carrier but you will need to test if it will work for you. For me I cannot switch for now due to contract regulations and fixing it, physically removing SIM is like going back to my iPod days. I feel it can be fixed either by carrier or by Apple with an iOS fix keeping the SIM at sleep at night while not using the phone instead of pretending to be Father Christmas jumping from chimney to chimney draining the battery. Let’s hope Xmas will be kind to iPhone users.

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.

Hi.

I am using iPhone 12 since one week ago and my battery draining overnight approximately 15-20%

Chart from last night and it said Siri 100% and Siri turned off (getting the same results every night after I sleep and wake up battery drained 15-20% the chart showing Siri 100% at idle, at the morning and when I am using my phone Siri not showing at all ) I don't understand how Siri activates itself at night, it already off and is that the reason I am losing 15-20% at idle?

Note: don't have 5G in my area

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.

I agree with that. In the place where the phone spent the night today, 2 LTE divisions. I conducted an experiment, put the phone at night literally 4 meters in another place in the apartment and the discharge was only 4% per night

I have the same problem with iPhone 12 Pro Max.

Supernaturally strong discharge of the battery regardless of usage. All cloud and location services are disabled.

Even in pure standby mode without any activity the battery discharges over 20% in 6 hours.

Turning off 5G does not help either.

I have already replaced the device and the effect is even a bit stronger with the replaced device.

The Apple support hotline told me that the problem is NOT known.

I should call again in two weeks and ask if the problem is known and will be tackled.

There is definitely a serious technical problem that needs to be fixed.

It's almost unbelievable that Apple is not aware of it.

In various forums the problem is now mentioned by many users.

In the Deutsche Telekom Shop they also told me that I am not the first one with this problem.

It is a condition that is absolutely unacceptable.

If it is not repaired soon, I will return the device.

What else can we do to make Apple react as soon as possible?