My understanding is the same as Chris's. 
https://www.lifewire.com/what-is-optimized-battery-charging-on-iphone-5210118#:~:text=Optimized%20Battery%20Charging%20helps%20to%20improve%20battery%20health,charger%20and%20delays%20charging%20to%20100%25%20until%20then.

--
Christopher (AKA CJ) =>÷
Chaltain at Outlook, USA

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Chris 
Chaffin
Sent: Wednesday, December 28, 2022 11:53 AM
To: [email protected]
Subject: Re: Charging Your New Phone, Anyone?


Optimized battery charging does not stop charging your battery once it reaches 
80%.  Instead, it slows down the charging process, and tries to go by your past 
charging habits to time it reaching 100% as close to when you normally take it 
off the charger.
So basically once it reaches 80%, it trickle charges slowly until it reaches 
100%.  This is how its always worked.

Now me personally, I keep my battery between 25% and 85%, because this does 
help prolong the life of your battery.  But I do this myself, it is nothing the 
battery optimization does for me.  My iPhone 11 Pro that I used until last week 
still had a battery life of 100% after 3 years of use.

In regards to the Battery optimization, here is an article from Apple Support 
explaining it.
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsupport.apple.com%2Fen-us%2FHT210512&data=05%7C01%7C%7Cb9cf0bc2b0f045333c6d08dae8fc6629%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638078467985407110%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=KTrSrLpxi6asikGks8pA12t65yVA1ZlIU8%2BOSRjJH98%3D&reserved=0

Hope this helps.

Chris


> On Dec 28, 2022, at 12:31 PM, Arnold Schmidt <[email protected]> wrote:
> 
> I thought the way battery optimization was supposed to work was that it 
> would get to 80 percent and stop, and would only go on to 100 percent after 
> learning your schedule, or every 24 hours, or whatever. Mine has never 
> stopped at 80 percent, neither has it refused to charge if I plug it in when 
> it already is over 80 percent. I have always just figured that battery 
> optimization just didn't work on the cheap phones, for whatever reason. I am 
> not quite sure what is going on. Although I wouldn't want to leave my phone 
> connected to power for days, I have always been a little skeptical about its 
> being all that bad to leave it connected for hours. After all, it backs 
> itself up while connected and the screen locked. 
> 
> Arnold Schmidt
> 
> 
> Sent from  Arnold's  iPhone S E 3
> 
> On Dec 28, 2022, at 12:11 PM, Sieghard Weitzel <[email protected]> wrote:
> 
> Except mine has never done this, if I plug it in at 10:30 and let's say it's 
> at 30% then if I check it a couple of hours later at Midnight or 1 AM it is 
> always at 100%.
> 
> -----Original Message-----
> From: [email protected] <[email protected]> On Behalf Of 
> Gordon
> Sent: Wednesday, December 28, 2022 1:02 AM
> To: [email protected]
> Subject: Re: Charging Your New Phone, Anyone?
> 
> Well Apple says it's better if your phone doesn't just sit there at 100 
> percent all the time. the battery optimization is designed to keep this from 
> happening. Lets say you go to sleep every night at 10:30 and plug your phone 
> in and you wake up at 5:30. Your phone might reach 80 percent around 12:30. 
> Then it will stop until around 4:45 or so where it will resume charging in 
> order to be at 100 by the time you wake up. If you use your phone more than 
> usual and put it on the charger early, it would then charge all the way 
> because the new schedule isn't recognized. so according to Apple, it's better 
> if you don't keep your phone plugged in all the time. It would put your 
> battery under unnecessary stress and could make your battery health degrade a 
> little quicker.
> 
>> On 12/27/2022 8:29 PM, M. Taylor wrote:
>> Hi Gordon,
>> 
>> Thank you for your post.
>> 
>> So, if Apple added the optimized battery setting, then it would seem that 
>> even when the phone is connected to a charger, it will not charge to 100% 
>> even though the A/C current is available, or so I would think.  This would 
>> lead me to believe that leaving the phone connected to a charger would have 
>> no detrimental affect on the device.
>> 
>> Batteries, batteries, batteries.  It would seem that, even at the end of 
>> 2022, they are still the weakest link in the technology food chain.  I don't 
>> know; just a thought.
>> 
>> You know what?  In my mind, I think of batteries in the same way as I think 
>> of printers; boring but necessary (smile).
>> 
>> Mark
>> 
>> 
>> -----Original Message-----
>> From: [email protected] <[email protected]> On Behalf 
>> Of Gordon
>> Sent: Tuesday, December 27, 2022 5:13 PM
>> To: [email protected]
>> Subject: Re: Charging Your New Phone, Anyone?
>> 
>> It's not good to leave the charger connected all the time. This is why Apple 
>> added that feature in battery settings called optimized charging.
>> This learns your sleep habits and keeps your battery at 80 percent 
>> for most of the night and kicks in and finishes charging up to 100 
>> percent before you wake up. Lithium ion batteries don't like stress. 
>> They are under the most stress when fully charged at 100 percent and 
>> below about
>> 15 percent. So that's why Apple says keeping your battery between these 
>> points is best for long life.
>> 
>>> On 12/27/2022 5:59 PM, M. Taylor wrote:
>>> Hello All,
>>> 
>>> Okay, based on my research I cannot find any Apple articles that 
>>> discouraged leaving an iPhone 14 on a charger, when not in use.
>>> 
>>> You old-timers will recall that, once upon a time, it was 
>>> recommended that one not leave a phone on a charger, when not in use, 
>>> full-time.
>>> It was thought that doing so would shorten the life of the battery.
>>> 
>>> I found an Apple community thread that discusses this and the 
>>> conclusion is that leaving a 14 attached to a charger, when not in 
>>> use, will, in no way damage or shorten the life of the battery.
>>> 
>>> Question:  Does anyone have any credible statements / sources to the 
>>> contrary?  If so, please post them as this can make a difference to 
>>> the life of the battery, in the long run.
>>> 
>>> Unlike in the past, I want to consider all aspects of keeping my 
>>> iPhone battery healthy from the very beginning.
>>> 
>>> All replies greatly appreciated.
>>> 
>>> Mark
>>> 
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