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IPhone 12 mini sudden Battery issue?

So I'm not sure how to ask but can you check if apple has loaded a program or update that drains batteries of older model phones.
-The Issue
i have an iPhone 12 mini that is mainly only used for work calls and nothing else. I disabled automictic updates like apps and syncs like emails but do update and sync on weekends. now generally on full charge with little use in the day the phone would be around 40 percent by end day (5am-8/10pm) and could still most often last two days without use. 
however, a week before the new iPhone 15 was to be released my phone suddenly started acting funny and its battery died way to fast, now on full charge at 10pm i would wake up to it at 44-30 percent at 5:30am (my work alarm) and if i go to work with a full charge (100% at 5:30am) it be at 20% by 2:30pm and that's with data off and Wi-Fi off (also tried airplane mode). so I'm going to get its battery checkout, but can someone ask around if this is common (or a way to test this)
there also been a new OS update the phone did 2 days after the battery problem started.
edit 09-25-23
So i doubled check every app and battery info. battery says its max cap is at 88% total and it did have the optimized charge and clean energy on but it turned them off now. also i check battery (Battery use and activity) and history for the last 10 days especially the days it drained fast and there's nothing running in background except home screen.
Edited by Chedoka
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I noticed my 13 mini drained battery a little faster and also broke some apps after updating to ios 16, im not updating to ios 17 over fear it will make things worse. Unfortunately this is just how apple is and theres not much that can be done.


You said you disabled app updates but have you disabled ios updates? Just disable stuff you dont use like apps you arent actively using, or anything that may happen in the background. And also things like bluetooth, airdrop, etc. all use battery even if not being actively used so id disable those if you dont use them.

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7 hours ago, Chedoka said:
there also been a new OS update the phone did 2 days after the battery problem started.

The first few days of a major OS update (iOS 15 -> 16, 16 -> 17) etc will be battery heavy as the phone has to index. 


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Just guessing:


Turn on power saving mode 100% of the time.


Go into every single app in the settings page, and individually on every singoe one, turn off the iption to "learn from this app" whatever it is called.  Also turn off background app refresh if that still exists as a setting.


Turn on the battery aging protection in battery settings, to stop charging past 80%/


In search / siri turn off everything you don't want to search for when you use it.


Delete all recently installed apps, and find alternative versions from different software companies, or use a web browser (safati recommended, or firefox) to access the same services, so programs installed do nat have to ability to run in the background.

: JRE #1914 Siddarth Kara

How bad is e-waste?  Listen to that Joe Rogan episode.


"Now you get what you want, but do you want more?
- Bob Marley, Rastaman Vibration album 1976


Windows 11 will just force business to "recycle" "obscolete" hardware.  Microsoft definitely isn't bothered by this at all, and seems to want hardware produced just a few years ago to be considered obsolete.  They have also not shown any interest nor has any other company in a similar financial position, to help increase tech recycling whatsoever.  Windows 12 might be cloud-based and be a monthly or yearly fee.


Software suggestions

Just get f.lux [Link removed due to forum rules] so your screen isn't bright white at night, a golden orange in place of stark 6500K bluish white.

released in 2008 and still being improved.


Dark Reader addon for webpages.  Pick any color you want for both background and text (background and foreground page elements).  Enable the preview mode on desktop for Firefox and Chrome addon, by clicking the dark reader addon settings, Choose dev tools amd click preview mode.


NoScript or EFF's privacy badger addons can block many scripts and websites that would load and track you, possibly halving page load time!


F-droid is a place to install open-source software for android, Antennapod, RethinkDNS, Fennec which is Firefox with about:config, lots of performance and other changes available, mozilla KB has a huge database of what most of the settings do.  Most software in the repository only requires Android 5 and 6!


I recommend firewall apps (blocks apps) and dns filters (redirect all dns requests on android, to your choice of dns, even if overridden).  RethinkDNS is my pick and I set it to use pi-hole, installed inside Ubuntu/Debian, which is inside Virtualbox, until I go to a website, nothing at all connects to any other server.  I also use NextDNS.io to do the same when away from home wi-fi or even cellular!  I can even tether from cellular to any device sharing via wi-fi, and block anything with dns set to NextDNS, regardless if the device allows changing dns.  This style of network filtration is being overridden by software updates on some devices, forcing a backup dns provuder, such as google dns, when built in dns requests are not connecting.  Without a complete firewall setup, dns redirection itself is no longer always effective.

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