iPhone 12 battery draining fast

Have the same problem with my iPhone 12. Bought it one week ago, and battery decreases 10% when idle during the night. The problem is not here every night. Last night I lost 10% in to hours according to iPhone battery settings. Sometimes the phone only loses 3% in 9 hours.

Why don’t you follow the best practice of charging the phone overnight? It will extend the useful life of the battery, it will assure that it is fully charged at the start of the day, and, if you turn on iCloud Backup it will create a new backup every night.

Once again, it does not solve the bug and it will bother many of us when we’re on the road. Also 8 don’t want to charge a lithium battery next to my bed or even in my bedroom. Why do you keep trolling?

I too also have experience battery draining. I got the iPhone 12 pro less than a week ago and I’m having way too many issues. Battery draining quicker than any other iPhone I’ve ever had when I first get it, my speed dial favorites disappearing and not being able to call from that, also my map favorites had disappeared. Unfortunately I do not have the patients to wait for Apple to fix it and I’m going to trade for an iPhone 11 Pro

I am also experiencing the same trouble on my new iPhone 12. It's draining on idle,i am always connected to Wi-Fi network in my home,i will not turn off my Wi-Fi on my iPhone 12, I kept it idle on night at 84% but on morning it was 78%....i think it was draining because of Wi-Fi....

Thesanjeevkhanna wrote:

I am also experiencing the same trouble on my new iPhone 12. It's draining on idle,i am always connected to Wi-Fi network in my home,i will not turn off my Wi-Fi on my iPhone 12, I kept it idle on night at 84% but on morning it was 78%....i think it was draining because of Wi-Fi....

To repeat what has been posted previously, unless the phone is plugged in Wi-Fi turns off when the screen locks, so your phone is NOT always connected to Wi-Fi. And yours is clearly not plugged in because the battery is providing energy overnight.

A 6% drop overnight if it is not plugged in is in the normal range. The phone is never idle, even when the screen is locked. It’s a computer, and unless you shut it off completely the processor is running, dynamic RAM is being refreshed, it is receiving notifications and updates, and it is syncing with the cellular network every few minutes.

Yesterday I did a full reset of my iPhone 12 (recovery mode restore with iTunes). With all settings at default it drained 17% over about 7 hours during the night (without any screen on time). This however might be attributable to the fact that is was a fresh install and it might have done indexing and what not.

Today during the day it’s only drained about 4% in 8 hours, so we’ll se what the drain is tonight. Seems odd if it drains more at night time than during the day. Hoping the reset will have solved the issue.

Guys, I have tested this issue with 3 different operators in Moscow, and I can tell you that battery drain differs from one operator to other. Ironically, biggest drain is on my own LTE operator Megafon. Lowest on MTS, practically like normal consumption on iPhone 11. Medium drain - on Tele2. It can explain why some people don't feel any problems.

Don't ask about 5G — iPhone activates 5G only on huge loads, on idle he uses 4G LTE connection.

Oh, I'm using megafon lte too. So, I faced that problem before updating to the 14.2. Now that seems to be solved or something about that, I lost only 4 % during 10h today's night.

Приветы) тоже на мегафоне в мск имел трабл, терял от 15 до 20 %, но на 14.2 все вроде пришло в норму, теперь теряю 4% за ночь.

Close to my bed, where the usually lies at night, I have 2-3 bars, sometimes 1, it changes randomly.

So as I've said, for me the problem seems to be solved after recovering from DFU to 14.1 and updating via OTA to 14.2. But 4-5% is still too much, I think

Well, I just read the follow up post, where he says 2-3 bars, sometimes 1. So my response stands. And 4-5% overnight, which is normal if you don’t charge overnight. While Apple hasn’t published the idle statistic for a while, it is probably the same 200 hours it always was. That works out to a standby discharge rate of 0.5%/hour. So in 8 hours it would be expected to drop 4%.

The other day, I posted that my replacement unit has excellent battery life. Well yesterday my phone was fully charged at 5pm and I tuned DND on. I didn't use my phone until this morning at 7am. So that's 14 hours on idle. I was again surprised that this new one discharged 17% of battery on standby just like the previous one. I have the dual sim version. Apple should do something about this software bug. I remember my 11 Pro Max. It remains at 100% for 24 hours on standby with active cellular network. No kidding.

To all guys who are suffering from this issue:

The experimental result on last night indicates that the battery standby curve of my iPhone 12 is now back to normal. I will share the solution in the following. First, you should reset your network settings. After that, the most critical step is that you must set the default voice line the same as cellar data. Now your iPhone should have the normal battery standby curve. I think it's a potential bug in iOS and I have report to Apple. Tell me if this solution works on your iPhone.

So tonight mine again increased the drain from 17% last night to 27% this night. There is no indication in the battery app on what’s causing the drainage.

Yesterday I left mine unused for about 8 hours during the day and it only lost 4%. In the battery app you can clearly see battery usage increase after midnight, without any usage what so ever.

m2linchen wrote:

To all guys who are suffering from this issue:

The experimental result on last night indicates that the battery standby curve of my iPhone 12 is now back to normal. I will share the solution in the following. First, you should reset your network settings. After that, the most critical step is that you must set the default voice line the same as cellar data. Now your iPhone should have the normal battery standby curve. I think it's a potential bug in iOS and I have report to Apple. Tell me if this solution works on your iPhone.

Can you explain the "critical step"? What do you mean exactly?