iPhone 13 Pro battery draining overnight

I had very similar symptoms to those described by nosleduc:

Brand new iPhone 13 mini with battery at 100% charge in the evening and a few times a week I found it in the morning with

• battery level 55-60%.
• Latest iOS installed - yes
• All background processing in apps deactivated - yes
• I even de-activated wifi, bluetooth and cell connection in the evenings - to see if this eliminates this strange behaviour - but it STILL kept repeating
• I also took my phone to apple service - where it was tested/diagnosed - nothing suspicious found.

But still most of the days the battery history chart in iOS would show gradual decrease: from midnight to 6 AM even though there was no app activity whatsoever.

Finally I think I found some corellation / explanation, though is seems pretty weird:

I noticed that the phenomenon occurs ONLY if the phone is left on a wireless charger (plain Qi charger from Spigen) AND if it is not placed exactly in the middle of the charger,

i.e. my hypothesis is that the phone 'notices' the charger and tries to connect, but for some reason cannot really start charging (because it is not placed exactly in the right spot) and there is some process that keeps repeating 'attempt to charge the phone' - but instead of charging this loop is actually draining the battery.

I know it sounds weird and irrelevant, but once I stopped leaving the phone on Qi charger overnight, the strange phenomenon has STOPPED completely. So (at least in my case) this seems to have resolved the problem.

I have now tried the following, the fix lasts 24hrs then reverts back to gradual overnight and usage battery drain worsening as the days pass

1. hard reset
2. network reset
3. iCloud sign out

why Apple does not have a fix is beyond me or have Apple owners become full time beta testers

No, my phone charges to 80%, then pauses for several hours at 80%. It then resumes charging and reaches 100% about an hour before I start using the phone. I suspect a problem with your wireless charging pad; try with a cable and see if that makes a difference. Some wireless chargers turn off when the phone stops taking power, and won’t resume until the phone is removed and placed on it again. Good quality chargers don’t do this.

ADDENDUM: This was with a Belkin wireless charger.

10% is still a lot for 6-8hrs idle. I also have issue and as shown below no app was recognized to be causing the drain. I lost ~15% for 6hrs idle overnight in my iPhone13Pro. Looking at my old iphone 8 plus it lost only 22% for 30hrs idle (i have not been using since i got the plnew phone) . I called the apple support andhad screen share and they agree it is quite unusual and recommend to ask for replacement thru my carrier. I will call my carrier and hopefully get this fixed.

Hi Doctor Zhivago. Here is the screenshot of my old iPhone 8 plus (on 84% battery Health, if i may add). Data/WiFi/Bluetooth for this phone is turned off since i am

ot using it anymore but the phone is Turned On. As shown battery drain is only 48% from Last Saturday which is almost 96hrs already. Phone is on the latest ios version.

This is the strangest thing I have ever seen. My 13 Pro Max is not even two months old. Battery Health is at 100%. It was plugged into a wall outlet, as my old iPhone was before this new one, and indicated it was charging all night long. You can also see in the picture that the screen was off. No music playing or anything. Any clue why? There should be no need for optimization of a new phone while it's charging and not actively used.

everyting you described happened exactly to me.

But the slope of my overnight drain is even more aggressive.I went to sleep with 82%. Woke up with the phone completely turned of.

My guess is the 5G network. But I'll try turning it of tonight.. 😭😞

While I am using the iPhone 12 mini, my experience echos many others here who are experiencing this with the iPhone 13. Due to the nature of the battery drain, this is certain to be a software issue exclusively. There is no hardware malfunction that could cause this.

Take note of the two regions of interest in the blue squares below.

The left-most section was overnight while I was sleeping and there was zero phone usage. The phone became hot, and as you can see, it slowly drained in a linear manner until it was almost dead.

The right was while it was on the MagSafe charger and with zero usage besides a brief period at around 4:30 p.m. While it had initially started charging like normal, the battery drained--while charging--until the phone was absolutely dead. Still resembles a linear pattern.

One doesn't need to take my testimony of "zero usage" to understand what the graph shows. On the left, there was absolutely no usage; and, as such, there are no dips in the linear response graph. On the right, there was a brief period of usage at the time indicated, but otherwise retains linearity.

This is, without a doubt, an issue with iOS and is something that Apple must address. Despite what others in the thread say, this is not due to having the wrong battery charging settings, or by having Background App Refresh enabled. If the latter is the cause, then it is still Apple's issue because Background App Refresh should not cause a total drain of the battery while charging. That implies that the feature costs more battery than simply using the phone as normal (video, Safari, games, etc).

Let's all hope this thread can raise awareness and see a fix to this in the next iOS update.

Ok. Well my reply might be considered to be amateur by the seasoned iPhone pros. But I figure I’ll pass it on anyways. Because my phone is now fantastic. Spectacular battery life after a poor start. This is my first experience with an iPhone. I’ve been using androids for years and got fed up with the battery usage. I went all out for the latest iPhone 13 pro max. Initially I had some problems Including once again poor battery life. So I did some surfing and found these YouTube iPhone geeks known as “payette forward”. I followed a couple of their tutorials to learn about the phone. Turning things off like backgrounding. Putting it in dark mode. A whole bunch of other things I can’t even remember made a huge difference. If I don’t use my phone at all for a day I’ll only lose 2%! Overnight nothing it doesn’t move. It does it’s charging thing which is different. I don’t worry about turning off Bluetooth like I used to with my android. I’m Sure most of you guys already know this stuff but here’s one of the many tutorials. Hopefully it helps someone. Like it did me.

https://youtu.be/VtOUZckmSRE

This is my battery usage from last night into today.

I am facing a similar issue where the standby and usage nearly take up the same amount of battery it makes no sense at all. Average of 20% to 30% of drain overnight. 13 pro and i have tried everything with little gain.

I would like to share my battery health page as I believe it is the worst case of this phenomenon yet. If my phone is at 100%, it will die overnight if not plugged in. This is totally unacceptable. In the app usage nothing corresponds with 12+ hours of continuous draining.

Thank you for getting back with us, nosleduc. While the articles we sent are intended to educate, they also offer specific steps to take to reduce battery drain, such as disabling Background App Refresh, which could be contributing to the overnight discharge. There have been no detected issues with iOS 15 or any new device that would result in this behavior, so we definitely want to look into the causes for this further.

Please let us know the results of your testing and we'd be happy to continue investigating. Thanks and take care.

You should enable Optimize Battery Charging and charge it all night, not disconnecting it until you get up in the morning.

It is the absolute best way to slow the decline of battery capacity long term. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates.

nosleduc wrote:

I have updated ios 15 to 15.0.1, I have also upgraded my apple watch 3 to watchOS 8.

I have shutdown all my apple devices except the watch

Today at 9 am, the battery was at 40%.

At work, the phone is not connected to wifi but only cellular.

As you can see in the following picture, I have charged to 100% at 1 pm and and get 70% at 7:30 pm after listening spotify all day and I watch a video youtube about 30 mm before coming home.

I charged it until midmight and then unplug it.

As you see, the slope of discharge is more important during night compared to daylight

I'm thinking an issue with my wifi or with cellular antenna around me

Well, it’s not Wi-Fi because the phone turns off Wi-Fi when the screen locks. A weak cellular signal will use a lot of power; one bar uses 10 times as much power as 4 bars (the signal strength display is logarithmic), and a cellular signal that disappears completely will use the most power as the phone tries to reconnect every few minutes at maximum power. What apps show the most power consumption?

Also, on your carrier’s website what times do you see the most data usage, keeping in mind that reported usage is at the end of a period of time, and includes all usage since the previous report. Depending on your carrier these reports will typically be 3 to 6 hours apart.