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.

Update 3:

I read somewhere that if the phone is powered off and still drains around 20% the next morning then it may be a hardware issue such as a short circuit or loose wire in the phone. In my case, it does drain when powered off. I took it to the Apple Store and explained the situation the third time. They ran their diagnostics and kept saying it’s fine and everything is looking good. I was adamant about it because something is definitely wrong. They did a repair and FOUND that the camera wiring to the circuit wasnt connecting. It was indeed a hardware issue after all. They replaced pretty much everything but the screen. And voila, battery issue was solved. No more draining at all.

Guys, if your phone still drains when powered off even after a factory restore (without restoring back up or logging into icloud), I really believe it’s a hardware issue of some sort. Hope for the best for y’all. Good luck.

I've had a similar issue with my battery draining too fast as well and discovered it was due to having no data allowance but still connected to the 4/5G network. I've had the iPhone 13 Pro since launch date and initially I would notice maybe 2-3% battery drain overnight.

However, in the last month I noticed a change where I was losing over 40% battery over night. It got to the point where I turned things off: notifications, GPS, bluetooth and uninstalling certain apps that I thought might impact battery life to no avail. I even resorted to charging my phone twice a day, not using the phone for a whole day and using automations to put my phone into low power mode over night.

Then I realised, I had used up all 8GB of data plan within the first week of my monthly allowance. As I was mostly at home and connected to WiFi I didn't think having no data with my mobile plan was an issue. Then I turned off mobile data (Settings > Mobile Data > Mobile Data = off) and this instantly fixed my issue. Overnight I only lost 2% battery again. A week later I had my 8GB monthly data back, turned data back on and the battery was completely fine.

So all this time, having ran out of data allowance and still connected to 4G/5G resulted in my phone depleting my battery over 40% over night and depleting during the day.

Did you migrate from a backup? I've hear some say that iPhones do a lot of background processing to optimise the install and it stops after a while. It didn't for me with my 13 Pro Max, so I reset all settings.

It's not as painful as you think, it just takes a long time of noticing things aren't quite as they were and giving them a tweak. It fixed mine - went from 30% + drain overnight straight to what I would expect of an iPhone battery, just a few %.

If you're not on a 5G Tarif make sure 5G is turned off, some have said that has some bearing on the battery drain issue but I've not seen a test that proves it.

What will you learn by checking each day of the week? To be meaningful you should also review the list of apps that used energy each night, the number of new emails, texts, notifications, app updates, etc., (and their sizes) that occurred overnight.

While Apple no longer publishes standby time (as no one ever lets their phone be idle for more than a few hours) the last time it was published was 200 hours, which would work out to 0.5% per hour, or 12% per day if the phone was never turned on, did no email fetches, received no notifications, received no push email, received no texts, did not have any apps that updated their content.

Remember, when the phone is not plugged in Wi-Fi is off when the phone is idle, so all of the above updates would use cellular data, and signal strength would be a critical factor.

The bottom line is that battery drain is 100% the result of apps using energy. So the more (and busier) apps that use energy overnight (even when the phone is “idle”) will result in more battery drain. If you can’t (or don’t want to) limit the apps that use energy is all the more reason to charge the phone overnight, in addition to the fact that it extends the useful life of the battery and it provides automatic backup.

After some investigation, I've found that it's Bluetooth that's causing continuous battery drain while on standby.

If I disable bluetooth, then the battery doesn't drain on standby at all.

I've turned off bluetooth on my Apple Watch, so that my phone's bluetooth isn't connected to any devices at all, and it still happens.

I've turned off airdrop completely, and it still happens too.

So, even with bluetooth on but connected to zero devices there's a constant drain. The only thing I can do to stop this is turn bluetooth off completely.

That's incredibly inconvenient because I need to use bluetooth earphones with an iPhone 13 since they removed the headphone jack...

I had EXACTLY the same thing and had to do a 'reset all settings' and it fixed it. My phone is just like I would expect now re overnight battery drain - around 5%. Reset all settings leaves all your data intact, but it's REALLY painful to get it back how you had it. Took me well over week - soooo many settings!

I transferred from my last iPhone though, and lots before that. If you set up as a new iPhone it might not be so painful.

I'm not on a 5g contact but 5g was checked, that might have done it but I doubt it (I did that at the same time as settings thing).

Good luck!

The issue is clearly connected to the cellular networking. If I turn airplane mode on before bed, the battery level is reduced by a mere 3-4% during the night; otherwise, it can be as high as 35%. What's not clear if it is only affecting iPhones with eSIM installed. Also, there is a high probability the battery drain depends on how weak your cellular signal is. Usually it's 2-3 bars for me, LTE. One bar would be devastating to the battery.

It is definitely cellular modem firmware or iOS software issue. Apple must take action in fixing it.

The latest upgrade 15.4.1 acknowledges a battery issue and provides a patch. So far so good. You might want to try that

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.

I state it because it is a fact. Wi-Fi uses energy continuously when connected, unlike cellular, which only uses energy when actually transferring data. It makes perfect sense from an engineering standpoint; if Wi-Fi remained connected battery drain would be REALLY unacceptable. Here’s a test you can do: Open a Terminal or Command window. On your phone go to Settings/Wi-Fi and tap on the i next to the network name, and write down the IP address.

On a Mac enter this command into the Terminal window with the phone unlocked:

ping <IP address> (for example, ping 192.168.1.10)

Note that every second it will ping the phone and report the result. Now lock the phone and continue to watch. After around 15-30 seconds the pings will start to fail, showing that the connection has been lost. Unlock the phone and they will resume. There are a couple of exceptions: if the phone receives a notification (all notifications use the cellular network) Wi-Fi will come back on for a few seconds to process the notification, but the rest of the time Wi-Fi is disconnected. Also, if there is a background process in active use while the phone is locked Wi-Fi will stay active until it finishes.

If Wi-Fi remains connected for one of these reasons that would account for battery drain when the phone is idle. A Wi-Fi connection uses 30 MW continuously. And thanks to the 2nd law of thermodynamics there is energy loss in the process, so the actual battery drain is closer to 50 MW. So in 10 hours the battery drain would be 500 MWH.

To stop the ping process use <Control>+C

If you are using Windows do this in a CMD window, and the command is:

ping /t <IP address>

Hi,

I also experienced the same issue and contacted apple support. Their suggestion was to get to repair center or have my phone inspected for replacement from my courier. I did not do both.

What I tried is to turn off cellular data during the night (at home when I am already connected to Wifi) and i don't get the issue of 20-30% drain overnight. It was down to typical 3-5%. I think the issue was if the cellular signal strength is not at optimum/maximum, phone keeps on searching even if connected to WiFi resulting to massive battery drains. But i agree that Apple should look into this, although it can easily fixed with software update.

Update: I contacted apple support, spent 2 hours on the phone, was elevated to info being sent to apple engineering. One week later did not hear back. Meanwhile I ordered a replacement phone through my carrier (I had my phone only 2 weeks). I got my new phone and it works perfect. The other was hot all the time and drained the battery with no use every couple of hours. My final summation is that there are some of you out there that may have gotten a bad phone just like I did. Try all the suggested fixes, but don’t dismiss the idea that it just may be your phone. Thanks to all of you for providing ideas of things to try.

I had a very similar issue with a new iPhone 13 Pro Max - it would lose 30-40% overnight, every night. It was a straight transfer from a 12 Pro Max which only lost 2-5% overnight.

I tried deleting and re-installing the apps that looked like they were draining the battery - made no difference.

After looking at a few videos online to see what could be done, I found that 5G was on despite me only having a 4G contract, so I changed that to 4G, and a couple of experts said to reset all settings - so I did. It’s a real pain, and it’s taken me ages to get it back to where it was.

However, one of those things fixed the battery drain - it’s now just 2-5% like my iPhone 12 was. Don’t know for sure which fixed it, but I suspect it was the settings reset.

I had similar problems and fixed it by disabling “Allow Siri when Locked”.

Before changing this setting Battery would drain over 40% during the night.