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I don’t know if this has been asked. But what hardware limitations do iPhone models prior to iPhone 15 have that this option isn’t available to the rest of us?
 
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You get a new one every year? So what does any of this matter to you? Why cripple your phone's battery for the 12 months you own it?

You will put up with a phone that only has 80% battery capacity in order to prevent the battery of a phone you'll soon be getting rid of from having 80% battery capacity 3 or 4 years down the line. Madness!

Do you also put covers on the interior of your car to keep the seats factory fresh for the next owner?
I usually sell my phone for around $950 each year, unlike the morons that get brainwashed into paying monthly for an iPhone for 24 months or 36 months, or claim they get a free upgrade while they are paying for the highest plan. I just don't want the battery health to drop as much not many people will buy an iPhone for $950 with 90% battery health.
 
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I don’t know if this has been asked. But what hardware limitations do iPhone models prior to iPhone 15 have that this option isn’t available to the rest of us?

The fact that they've already had X amount of charge cycles and non-genuine batteries fitted in numerous models.
Yes it could be implemented back to older iPhones, but Apple have chosen not to for likely the above reason(s).
 
I usually sell my phone for around $950 each year, unlike the morons that get brainwashed into paying monthly for an iPhone for 24 months or 36 months, or claim they get a free upgrade while they are paying for the highest plan. I just don't want the battery health to drop as much not many people will buy an iPhone for $950 with 90% battery health.

Well, since you seem to think everyone who takes an interest free loan and device credits is an idiot. I will leave you with this.

My iPhone was $200(I upgraded the storage), my friends and parents got the 256gb version so they just had to pay taxes. Their phone was largely free. I was going to be in the cellular plan anyway. I didn’t go into this plan to get the upgrade. Add in that the money I don’t shell out at once actually does go into investments and not just sit and do nothing. I’d be an idiot not to take the installment plan.
 
I don’t know if this has been asked. But what hardware limitations do iPhone models prior to iPhone 15 have that this option isn’t available to the rest of us?
It's purely software. You could manually switch off your charger when the battery reaches 80%.
 
Mine goes on the charger at night on the normal optimised setting. Don't see the point of restricting the battery voluntarily to 80% throughout its whole life instead of after 2 years plus of use.

Would flick it on with extended use in my car say on a road trip or something to stop it sitting at 100% all day long.
 
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I usually sell my phone for around $950 each year, unlike the morons that get brainwashed into paying monthly for an iPhone for 24 months or 36 months, or claim they get a free upgrade while they are paying for the highest plan. I just don't want the battery health to drop as much not many people will buy an iPhone for $950 with 90% battery health.
I turned it on for me as I drive a lot and my phone is constantly on the charger due to CarPlay.

You’re either selling to family or friends or live in a rich area as the going actual selling price for the 14 Pro max is around $600-$700 on craigslist/offerup. On ebay it goes a bit higher at around $900, but you get ripped off on seller and shipping fees of around $150 and the risk of fraud from the buyer is always there. I did the math, I save a measly $100 per year if I buy the phone outright and then sell in my area vs using IUP.
 
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Short answer I have is NO. I see no reason to even worry about the battery health of a phone as I consider it a consumable item. I also don't keep my phones over a couple years and sometimes I only go a year when I want to have some feature that the newer phones have.
Keeping it for an extended period: use the 80% setting.

Upgrading after a year or two: don’t worry about it.
 
I don't understand how this will help anything.

From my understanding, these batteries degrade based on charge cycles. So charging up to 80% and using 50% of the battery will give you half a charge cycle. But charging to 100% and using 50% of the battery will also give you half a charge cycle.

What's the difference?

I have noticed my MBP is being held at 80%. For my work the last few months, it's sat around plugged in and I'll grab it to do some quick work on it. The battery has 67 cycles and has 89% design capacity, according to CoconutBattery. macOS's settings says 94% maximum capacity.
 
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I don't understand how this will help anything.

From my understanding, these batteries degrade based on charge cycles. So charging up to 80% and using 50% of the battery will give you half a charge cycle. But charging to 100% and using 50% of the battery will also give you half a charge cycle.

What's the difference?

I have noticed my MBP is being held at 80%. For my work the last few months, it's sat around plugged in and I'll grab it to do some quick work on it. The battery has 67 cycles and has 89% design capacity, according to CoconutBattery. macOS's settings says 94% maximum capacity.

Heat, staying at higher voltage (100%) or 0% for long periods have a negative effect on battery health in addition to the normal wear you get from using up charge cycles.
 
Nope. I only need the battery to last a year. My 14 Pro Max was down to 91% after a year and I wasn't worried about it at all. I upgrade every year.
 
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My launch day iPhone 14 Pro dropped from 100% to 99% capacity about 4 weeks ago. Last week, I sold it to a company (that wanted it to have at least 80% capacity) for ~70% what I paid for it last year. For context, and none of this is directed towards you and your experience, I lived in a hot country for a lot of this year, and I charged the iPhone overnight almost every night on the MagSafe charger of a Belkin BoostCharge Pro charger. I barely ever used a cable, and it was used often with wireless CarPlay. Needless to say, I didn't really go out of my way to look after it, yet it was still on 100% at around the 11-month period. I didn't put it on charge when it was almost full, though, and it rarely ever got very low. My wife charged her launch day iPhone 14 Pro the same way, and it has 98% capacity now.

In general, echoing a lot of what others have said, my point is that it's likely just not worth worrying too much about it. I do care, and I want to look after my devices, but I managed to find a sensible (for me) balance this past year. What I don't see many people mentioning when discussing battery capacity is what they actually do on the phone between unplugging it in the morning and plugging it in at night. They can trickle charge it on the slowest charger all they want, but if they're hammering multiplayer games at full brightness on a 5G connection, pushing the device to its limit, they're likely doing more harm to the battery than leaving it plugged in overnight.

Enjoy your new iPhone when it arrives! I got an iPhone 15 Pro on Friday and I love it.
Thanks for the update and the reply. Yeah I’m anxious to get mine. I do so much photography on my iPhone and at first I wasn’t going to upgrade because I didn’t feel that the Apple event clarified that the new phones are any better than the 14 pro max that I have. However, after Playing with one in the local AT&T store, quickly realize that it’s quite special. So I went ahead and paid my next up fee to upgrade early on both of my phones. Now all I have to do is wait. I should probably stay away from these forums for a while because seeing everybody getting their new phone causes a little bit of anxiety as I’m waiting for mine. Lol.
 
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I am curious as to what 80% is defined as. Because the iphone already limits a range of the battery capacity. iPhone reading 0-100% charge is actually between 15%-90% of the actual battery capacity, did they extend the safety limits and low key saying charge the extra at your own expense... or is it really 75% of that battery wont get used.
 
I wish there was a way to set a schedule for this. Could be via Shortcut or in the settings app.
I would like to set the charge to 80% during the week. I am in the office or driving enough connected to a charger that 80& is fine.
Then, set 100% on the weekend when I may need the extra capacity.....
 
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Heat, staying at higher voltage (100%) or 0% for long periods have a negative effect on battery health in addition to the normal wear you get from using up charge cycles.
The graphite anode in li-ion batteries also literally expands and contracts with the charge level by about 10 percent. This physically stresses and decomposes the material. This is why cycling within the midrange is healthier ... you aren't "blowing the balloon" up to 100 percent.
 
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The problem is, by only charging the phone to 80%, you increase the chance to end up below 25% 😂
Valid point! Hence the option to go to 100% on busy days. Every day a busy day? Just ignore my advice and go 100% all the way. Tweaking option: get a smart plug and program your phone to charge to 60%, stop and resume charging two hours before you need the phone. it really works.
 
May already be mentioned but your phone will probably still show 0-100% charge, but that will be of 80% of the battery total capacity.

For example I have this setting on an HP laptop. It’s set to only charge 80% of the capacity but still shows 0-100%. It just lowers the “ceiling” so to speak.
 
I likely will NOT do it. But because of this feature, and what I've learned since people started discussing it, I'll begin NOT going for 100% if I'm topping up mid day. I have the base model 15 that I picked up Friday afternoon, and I haven't charged overnight yet. I've only topped up a little here and there during the day. But really haven't put it on the charger for any significant amount of time. I'm definitely going to charge less and only as needed, and again, try to train my brain as seeing 80% as "good enough". I'll likely have it on Magsafe charging on my commute 45 minutes each way. My commute charging, plus a little mid-day boost might be enough.
 
iPhone 15 Pro (Blue 128 GB) first opened and used Friday night (9/22, 7 PM PT)

Plugged into USB while restoring via Quick Setup after first installing the 17.0.2 update. That process is quite smooth and took 2 hours for a 120 GB restore.

Cycle count at that point was 1.

Next day I went around and used it normally to break it in, took pictures. Didn't allow the battery to drop below 50%, plugged it in or used MagSafe battery pack at various points to top it off. Towards the end of the night, I checked the cycle count and it was 2. Then I went into Settings > Battery and changed it to the 80% threshold. I left it on the battery pack before I went to sleep.

Next morning the cycle count was 3. Battery was at 80% as expected. MagSafe battery pack was fully discharged.

While I appreciate the information Apple is providing with this, I'm certain that at some point I'm going to stop worrying about it because I expect to replace the battery in two years assuming that I keep the phone. I also own a decade-old EV with less than 100 miles of range, so I LIVE battery anxiety.
Today's update:

Cycle count this morning was 4 after a 100% charge (I switched from 80% to Optimize). I used the phone normally today, screen time is slightly over 3 hours so far at 2:30 PM. Battery dropped to 46%. I switched back to the 80% setting and plugged in, the idea being that I have a 90 minute commute and I'll need that extra juice to get me through it.

It's really about weighing the number of cycles vs. the battery health/lifespan. Again, probably won't matter in 2 years when I either replace the phone or the battery. One thing I noticed is that over the weekend the cycle count ticked up from 2 to 3 even though I set the limit to 80%, not 100%. It is interesting that some reviewers are reporting 4.5 hours of screen-on time regardless of settings, with all the radios active. That's probably going to be my average as well, which could be disappointing based on use case. I'll have a charger nearby nearly everywhere and a portable battery at the ready when I'm away. Batteries are made to be consumed.

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Assuming the titanium and glass hold up in the long run, I'd like for this to be the first iPhone I hold onto for 4-5 years. If that means a battery swap along the way, so be it. It would be cool to set charging profiles on a weekday/weekend schedule the same way we can set alarm clocks.
 
Hmmm after reading 7 pages of posts I still don't know, if this feature is useful or not, if it makes an impact on the battery life of my 15Pro or not...confusion 🤪
It’s all pretty simple really, but the majority don’t seem to understand what it’s actually for.
Do you have your phone on charge pretty much all day everyday?

If you do then select the 80% limit, if not select optimised charging.

For me personally the phones pretty much plugged into the car all day for navigation so 80% limit for me mon-fri, will switch back to optimised charging on Friday evening for a full battery over the weekend when I’m likely to use it more off charge.
 
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