iPhone 12 battery draining fast

Tbh 14.4.2 actually did it for me , now my 12 pro max drops 2% in the span of like 6hrs approx with 4g on and conmected to wifi. Earlier on 14.2.1 i used to get the same results but i had to switch sim to 3g only.

I had the exact same problem on my new iPhone 12 after iOS update. Battery chart showed losing power overnight even when idle. Turned off "raise to wake" - under settings, display & brightness - now all good. Battery chart for last night looks normal.

After about a month with my iPhone 12 Pro Max I one day realized I was having to charge it twice in the same day. I went to settings--> battery and reviewed the activity and the app "microsoft translate" had been running in the background for days and rapidly draining the battery. I had only used the app once for about 15 seconds a few days prior. Once I deleted the app I'm back to a normal shelf life for the battery, only having to recharge once a day.

Guys. I don't know how many read this thread still, but I think I figured out what the issue was/is yesterday. At least in my instance.

There was an addition package (free) that I subscribed to when I opted into a new contract two years ago, which basically provides a dynamic IP address within the cellular network. Yesterday I unsubscribed from that very add-on and since then the drain has stopped and gone to completely normal. Before I would lose roughly 5 percent every hour if I left the device just idling (not in airplane mode). Now its basically down to roughly 0,5%-1% every hour which I guess is normal. I would advice to check your contract and/or maybe contact your carrier to see wether you are subscribed to a dynamic IP thing as well and if yes, ask yourself if you really need it. I assume the frequently changing IP address keeps the phone or the cellular modem from going into sleep mode and hence continuously uses power. Of course, this most likely does not fix any other drain issues where the battery hog is some specific app showing up in the battery graph. But this maybe is the fix for the 'steep steady declining battery level for no apparent reason whatsoever' people have been plagued since months.

Also, I highly doubt that iOS 14.7 or any modem update had something to do with it, as its been almost a week since I updated the OS and the change only happened right after I opted out of the dynamic IP subscription!

Is it the same steep decline when you are outdoors and not connected to any Wi-Fi?

Did you try completely resetting your router?

Nachdem du dein Gerät auf Deutsch hast, schreib ich jetzt einfach mal auf Deutsch weiter. Ich hab das selbe schon mal auf English in diesen thread geschrieben und man wird es mir nicht übel nehmen, wenn diesen Kommentar nun niemand versteht.

Ich hatte so in etwa das haargenau gleiche Problem seitdem ich mein 12 Pro im Dezember erhalten hab. Ich hab mir die Haare gerauft, dies ausgeschaltet, das ausgeschaltet, zahlreiche (DFU) Restores und und und. Es gab vermutlich Nichts mehr was ich nicht probiert habe und dann hab ich, zumindest in meinem Fall, die Lösung gefunden. Es lag bzw hing mit dem Mobilfunkanbieter zusammen. Apple hat da nix mit zu tun, und deswegen können die das auch nicht mit einem Update lösen bzw habens bis jetzt nicht tun können.

Ich bin seit 2 Jahren beim A1 Anbieter und hab irgendwann im Laufe dieser zwei Jahre ein gratis Zusatzpaket abonniert mit der Bezeichnung "Mobile Dynamic IP". Frag mich nicht genau wofür man es braucht, aber ich hab einfach gedacht, kann vielleicht nicht schaden so eine dynamische IP Adresse im mobilen Netzwerk. Bevor ich das 12er bekam, war mein Akku vom 6s schon so dermaßen schlecht, was eigentlich der Hauptgrund war wieso ich mir überhaupt ein Neues angeschafft hab. Beim 6s wurde in den 5-6 Jahren insgesamt drei mal der Akku getauscht (jedes mal gratis durch Apple, also war eh super) und obwohl der letzte Akku erst knapp ein Jahr alt war mit noch 98% Leistung, hatte das 6s schon das genau gleiche Problem. Der Akkustand fiel einfach steil ab. Genau wie bis jetzt beim 12er. Da zuckt man auch erst mal zusammen. Über 1000 Euro raus und dann hat das Neugerät das gleiche Problem wie das Alte.

Aber es stellt sich heraus, dass dieses eine Paket der Übertäter für die (meine) Batteriemisere war. Sowohl damals beim 6s als auch beim 12 Pro. Als mir der Gedanke kam, dass es eventuell ja an diesem Paket liegen könnten hab ich es mal abbestellt, gewartet bis die Änderungen in Kraft getreten ist, und siehe da. Alles normal! Das ist jetzt 3 Wochen her und ich habe seither nie mehr so ein Problem mit dem Akku gehabt!

Vielleicht hilft dir das ja weiter und du musst mal in deine Tarif-eigenschaften/einstellungen schauen

I’m still conducting tests, but in my case, it APPEARS that the problem was two-fold:

1. Finder/Wi-Fi bug caused by macOS Big Sur 11.4+ and/or iOS 14.5+. Disabling “Show on Wi-Fi” in Finder fixes this.
2. AirTag firmware 1.0.276, deployed June 23, 2021. Disabling Find My under Settings → iCloud → Find My → Find My iPhone → Find My network fixes this. (This applies even if you don’t own AirTags, but live eg. in an apartment complex, where many tenants may own Apple devices that participate in the Find My network, and thus, could be pinging your iPhone/iPad all-day long.)

Again, I’m still conducting tests to make sure those are the only two culprits (and that they are both actual culprits). But as of this writing, I am becoming extremely confident in these findings. It’s only with both of those settings disabled that my battery remains flat most of the day while idle. Otherwise, it drains ≈5% per hour AT BEST.

Hopefully I’ve stopped the insane battery aging on my 12 Pro Max. It went from 100% health in late June to 95% health in early August—and that’s with me being out of town (away from the battery drain) 2 out of those 6 weeks! I’m kind of glad iPadOS doesn’t show battery health, because I’d be ****** if I saw 95%, 2 months into owning a device I intend to keep for 4+ years.

Ok, I'm at a point where I can turn the battery drain on my iPhone on or off at will, without touching the phone.

First I did what Lohvarn suggested, plugged the phone into all Macs via USB and disabled the "Show this iPhone when on Wi-Fi" setting. Did that on one Big Sur and one Catalina Mac, on the Mac server it didn't show up in the Finder. Ok, whatever.

Now, on that server I have an application running the nightly iOS backups for the entire household, called iMazing. There is a helper program called iMazing Mini which runs 24/7 and manages all the background activity. I suspected this application earlier already when I noticed constant CPU usage of iMazing Mini even during the day when no backups are scheduled, and found that I could stop the battery drain by quitting iMazing Mini. But I wasn't able to reproduce that at will.

After disabling the Wifi setting in Finder, I can again. It seems to me that iMazing causes similar protocols to be invoked talking to the phone all the time, as the Finder or some macOS system process does when that setting is enabled. Look at this:

I started the experiment at point A with 68% after some active use, with iMazing Mini still running from the night before. No active use since then except to check the battery percentage. At point B, I quit iMazing Mini. Started iMazing Mini at 15:00, but only clicked on it to show device status at 16:00, which is point C, where drain started happening again, and phone became warm again. Quit iMazing again at point D after it used up almost 3 minutes CPU time on the 2012 Mac.

I've been in contact with the iMazing 2nd level product support about this before, but didn't have more details to report. Will get back to that now. Maybe they have an idea how to figure out what's going on here.

By the way, no bluetooth setting of any kind has an influence worth mentioning on my phone. CoVID notifications, Find My, anything, none has a noticable effect remotely comparable to this.

My iPhone 12 Pro was working fine up until a few months ago when I started noting rapid discharging - fully charged phone would drain completely with ini 8 to 10 hours. Worked with Apple support/Genius bar and followed all suggestions including turning off multiple features, deleting apps, reseting phone and setting up as a new user - no resolution. Store rep finally agreed to replace my phone battery. Unfortunately, even that didn't fix the issue.

Solution: I remembered that few months ago I had switched over to Deco M9 mesh wifi, but I still have my regular standalone router as a back up. So, just thought of switching routers to see if that was a potential cause. When I disconnected from mesh wifi and connected to my the regular router wifi, the issue seems to have stopped. Now, my phone is able to hold charge albeit with expected slight drain due to weak AT&T mobile network signal in my area. Just posting to see if others benefit from my experience.

This was the post that fixed it: https://discussions.apple.com/thread/251956914?answerId=256416307022#256416307022

In case the link did not work, here's the TL;DR; (curtesy of user0197):

• Connect the iPhone to your computer
• Have a look into the Finder on Mac or iTunes on Windows and inspect the device settings
• Disable 'Show this iPhone on Wi-Fi'
  • OP suggested, that in case it's already disabled, you should toggle it on and off again
  • OP also suggested to reboot all devices, but I did not need to do that

Do you have 'Show this iPhone on Wi-Fi' enabled in the Finder on your Mac or iTunes on your windows pc?

To check, connect your iPhone to your computer.

If the option is turned on, try disabling it and reboot your devices.

If it is off, turn it on, click the Apply button that appears right next to the storage bar, then disable the option again, click apply again. Reboot devices.

I also had a bug where the 'show iPhone while on Wi-Fi' was working in the background but the phone did not show in the Finder (it did however show in 3rd party apps like coconut battery, even though the phone wasn't connected via a cable) and the only way to fully cancel and restart the feature, if you really need to use it, is to enable it, then disable it and then either leave off or turn back on. Just for testing it out, you should leave it turned off for a couple days.

Hope this helps

I tried this yesterday & it seems to have solved the issue for me. I only lost around 4% overnight without needing to use low power mode etc. I’d recommend others experiencing the rapid idle battery drain to hard reset!

Since the other thread on overheating has been run into the ground, I figure I should add this here as well.

I had 2 instances where my phone when idle or mostly idle (outside of quick notification checks), heated up pretty warm and dropped ~10% in 10-15 minutes (which is extremely fast) Outside of these times the battery is excellent and support ran diagnostics to find the battery in good health. Since the phone was hot, it leads me to believe something is incorrectly putting it under load. I fixed this situation both times by restarting the phone.

The first instance the phone was not on a charger, the second one it was on the MagSafe charger. Here are screenshots below showing the battery drop from 100% to 89% while still on the charger!! This happened over a 10-20 min period and the few apps you see open in the screenshot were opened after it had already dropped.

Do you use DUAL SIM? I'm asking because my iPhone 12 Pro does the same but only when the second SIM is active. If I deactivate the second line the battery consumption is back to normal. Would be nice to know. I have a support call from an Apple engineer coming in later today, let's see what he's got to contribute.

no! wifi enabled, 4G sim enabled, cellular data disabled. Battery drain is about 4% in a hour. When i disable sim or switch to 3G drain is stopped - about 0.5% in a hour. When i disable both wifi and cellular data but continue connection to cellular network - drain still continues. Battery drain does not depends to wifi or mobile data enabled or not, only to sim card connection to 4g network.

Every time I get home I turn wifi on and my data off! And still I’m loosing ~25% battery every night. Also I don’t like to charge my phone during night. I never did this on my iPhone 8 and I’m not gonna do this on my 12 either. The problem, I think, is just the sim service or something else with SIM. I went into airplane mode and lost 1% during night. I mean that can’t be a coincidence.