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I guess you are referring to models older than X? I only have personal experience with X and iPad 2018 on IOS 13 and to my surprise I haven't noticed things getting worse from 12 to 13. Actually 13 feels a bit snappier running at least on X and I can't say iPad is much different and I haven't noticed any difference in battery life either but it has been already poor on both my X and iPad for a long time...
 
So you agree with planned obsolescence? :)
I do. Don’t live in cave. Traded in my covered wagon ages ago. Cook over a gas stove instead of campfire , except when in nostalgic camping mode.

I don’t want my latest phone and IOS compromised in any way to keep your older phone/battery running at optimum. Yes I could put 1970 bias ply tires on my 2019 SUV but I don’t. And if that means you can not get bias belted tires for your older Chevy so be it. Sorry but I am surging ahead even if it costs you. Not being mean, just way it is.

With that said, don’t put much store in battery percentage stats. They are software estimates not absolute truths. Percentage says nothing about chemical health of battery which greatly effects discharge rate.

If your battery is two or more years old and you see degradation in length of daily use life. GET THE BATTERY CHANGED OUT BY APPLE. Then evaluate obsolescence conspiracies due to software updates.
 
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Fiancé has a pretty much release day X (got it 2 days after release) on iOS 13.1.2 or whatever the current software is. Not a single issue.
 
It's been proven using coconut battery. Try this. Charge to 100% and then use your phone non stop until you hit 99%. You'll get 20-30 minutes of screen time before it drops to 99%. Why? Because when it finally drops to 99%, it's really 96 or 97%. If you could actually get 20 minutes of screen time for every 1% then an iPhone would last a week on a single charge.
What part of, battery percentage software are approximations, don’t you get. The built in software nor coconut battery are calibrated precision measuring devices. They are feel good generalizing trending reports. Using them to think you are precisely measuring battery health and quoting tenths of a percent results are a fools errand. Show me the NIST calibration certificate.
 
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On iOS 11.3 or earlier, my X used to give 4 hrs of screen time from 100% to 60%. With 8-10 hrs of total screen usage.

As of iOS 12 (all versions), my X (earlier 100% battery initially on iOS 12, now 97% battery) comes down to 60% in about 2.5 hrs of screen usage with a total screen usage of 5-7 hrs with similar usage.

My 7 met the same fate as iOS 10/11 progressed. Initially 8+ hrs and later barely 6. With a near fresh battery.

My mom’s 7 started with 9 hrs screen usage and is now down to 4ish with a 100% battery on iOS 12.

Many of these devices have been DFU restored and started clean wi

Happens across every single iPhone.

Will happen to XS series as the year progresses. And so on.
Are you saying batteries lose capacity over time? If so this is shocking.

Apple still laps the field multiple times in long term usability of their phones.
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Not many. Just Apple and Samsung.

I have owned other brands. No other brand engages in this.
What phones offer 4-5 year hardware / software usable life cycle?
 
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