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90% here, 8 months and 157 cycles. Called Apple, they said it's "normal" that every 15 cycles battery loses 1% capacity. I say that's ********. Never did I have an iPhone battery lose capacity so quickly.
That’s [bleeep]. My iPhone X is on 158 cycles and still has 100% capacity while my 12 pro has 109 cycles and 90% capacity, so fairing even worse than yours. Also doesn’t Apple’s own documentation say that it should retain at least 80% capacity after 500 cycles? The way things are heading, there’s going to be a lot of replacement battery claims in the coming months.
 
Somehow I'm at 394 cycles (according to the analytics logs) and am at 88% battery life. I have no idea how my cycle count is that high, but I guess 88% isn't that bad then.

Launch day iPhone 12 Pro
 
Also doesn’t Apple’s own documentation say that it should retain at least 80% capacity after 500 cycles?
“Up to” not “at least“ but 500 cycles is the estimated usage point when a battery could/should be replaced.
Apple said:

iPhone Owners​

Your battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles. The one-year warranty includes service coverage for a defective battery.

The way things are heading, there’s going to be a lot of replacement battery claims in the coming months.
The following is a little evidence to the contrary.
Launch day 12 Pro Max. Cycle count 172. Battery health 96%
If overall linear, 80% won’t be reached until ~860 cycles.
 
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The pro max does seem to be fairing better than other iPhone 12s from what I’ve read. If you have a look at the battery health survey thread, nearly 70% of people are reporting worse battery degradation than previous iPhones. OK this isn’t a scientific survey and macrumors forum members probably aren’t representative of the general population of iPhone users, but it does suggest a more fundamental problem than just the odd phone.
 
Could there be some lower quality batteries (cost saving, manufacturing limits, or other)? Yes.

However, I think, two other factors are very probable culprits:

• iPhone 11 series battery capacities spoiled expectations for routine upgraders.
• Apple may have misjudged just how much pulling back to XS series battery capacities while adding certain improvements was impactful.
— Not only 5G but slightly larger screens (i.e. more pixels) and Dolby Vision HDR recording, just to name a few.
 
Somehow I'm at 394 cycles (according to the analytics logs) and am at 88% battery life. I have no idea how my cycle count is that high, but I guess 88% isn't that bad then.

Launch day iPhone 12 Pro
Compared to my 89 cycle count and 84% Health, it's good. But like Apple said "normal."
BULL!

Yet..oddly every since I upgraded t0 14.7, this Battery Health has stayed at 84 for over a month now. May sound good for many, not me.I said it before, I WANT this battery to drop to 80% as soon as possible to get the battery replaced free. Ugh, whatever the case...at this point if I have to pay $69 for the replacement, fine!
 
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My launch 12 pro dropped from 99% in January to 90% by the first week of June. The battery has stayed at 90% since that time. Not sure what changed but seems my rapid battery health decline has stabilized.
 
Wow! I got my iPhone 12 Pro on November and mine still has 100% battery health. Seems like it really makes a different to try to keep battery level between 20-80%. I’ve been trying to follow this ”rule” and hardly ever charge my phone up to 100%.
 

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my launch day 12 pro is at 86% with 234 cycles. Since I started checking a month ago, it's been losing 1% every week. I'm hoping to get the Iphone 13 when it comes out next month so hoping I won't need to have the battery replaced before trading it in.
 
Launch day 12 pro max, on the iOS 15 beta train, fast charge 20W charger, switched to belkin 3-1 MagSafe charger, 15W charging.

Battery health still 100% only charge phone in the morning to 100%.
 
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my launch day 12 pro is at 86% with 234 cycles. Since I started checking a month ago, it's been losing 1% every week. I'm hoping to get the Iphone 13 when it comes out next month so hoping I won't need to have the battery replaced before trading it in.
84% with 91 cycles. Just sad!

I plan to keep this until iPhone 14 and hoping this battery drops below 80% before Nov. (It was dropping fast, 1-2% every 7-10 days but ever since updating to 14.7, this battery health has stayed ay 84% since. How interesting.)

Whatever..if I have to drop the $69 bucks after Nov, so be it.

But yeah I get it, resell value for those wanting to upgrade from 12 to 13s are a bit tricky with many dealing with these extremely poor battery levels now. SMH.
 
I have the same , my battery health is 94%. I brought the phone 12 pro on December 2020 with my friend.
He use 4G network and his battery health after 8 months is 100% and for mine go 94%.
I think 5G will cause the phone battery health drop more as the phone is hotter
 
Launch day iPhone 12 Pro Max, battery health is still at 97 % but I have definitely noticed a drop in battery life. I used to charge my iPhone AFTER waking up in the morning to 100 % and it would last me until the next morning with still around 40+ % left (I do use it a lot) but now I have to charge it in the evening already and then again during the day. I am so "anal" about it that I have already tried resetting all settings and keep checking what settings I may need to turn off but I do not know. This has happened to me on every iPhone I have ever owned for some reason. First impression is great but few months in and I am always checking settings. Maybe it is also an personal obsessive issue LOL
 
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had to reschedule my Genius Bar appointment for next week, but here's some stats from my 12 pro release day device
 

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Launch day iPhone 12 Pro Max, battery health is still at 97 % but I have definitely noticed a drop in battery life. I used to charge my iPhone AFTER waking up in the morning to 100 % and it would last me until the next morning with still around 40+ % left (I do use it a lot) but now I have to charge it in the evening already and then again during the day. I am so "anal" about it that I have already tried resetting all settings and keep checking what settings I may need to turn off but I do not know. This has happened to me on every iPhone I have ever owned for some reason. First impression is great but few months in and I am always checking settings. Maybe it is also an personal obsessive issue LOL

Haha… personal obsession <> hobby, what’s the difference?

On your next phone, you should try a ‘custom optimization’ cycling ~80-20 (based on your 60% initially usage), automated with a smart plug. I personally only use ~50% batt/day and have no noticeable loss in runtime after 2yrs.
 
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