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Why did you not exchange it?

I asked but it’s within a given tolerance. It’s a company phone so you have personally less stakes in there and though I didn’t escalate things. It also seems to be quite common once you crawl the www. Yet it obviously reduces my battery life though...
 
Stupid question: does this work with 3rd party battery cases like Mophie? While I would guess yes, since it's the same with Apple's own case—I still wondered if something could overwrite this functionality (especially in beta).
I'm guessing it won't because in a third party battery the third party battery pack is controlling its own charging. The internal battery charging is controlled by the iPhone.
 
So basically they just admitted that charging the phone overnight every night is actually bad for the battery in long term!

I thought these iPhones already had built-in “overcharge” protection and whatnot??
 
Great idea. The product that really needs this is AirPods. I've noticed their battery life has decreased much faster than other Bluetooth headsets, perhaps in part because they are being charged 22 hours a day.
 
Could someone explain how this is a good thing? Is it about internal temperature going up higher from 50 to 100 over 50 to 80 and then the remaining 20 an hour before you wake up?
 
Very innovative! And neat too. I like this feature a lot assuming it works well and is usable.

The battery will automatically adjust to last longer. Wow that's incredible.
 
I'm guessing it won't because in a third party battery the third party battery pack is controlling its own charging. The internal battery charging is controlled by the iPhone.
Diving deeper, then guessing Apple’s own case will support it still. But what about during the night. If I charge my phone in a mophie case wirelessly or with cable, the phone should stop at the 80% then? Since it’s external charging anyways and won’t affect iOS 13 preferences ?
 
My typical before-going-to-bed routine is to plug my phone into the charger and turn it off. In the morning I unplug it and turn it on.

I'm assuming this few feature won't help in my case, so maybe I should start using do not disturb and airplane mode.
 
I'm all for anything they can do to optimize battery performance and extend life, so well done on this one. However, at the end of the day, the one thing they could do to really make a difference is make all the phones just a mm thicker and fill it with battery. Bigger battery is what I want, as much as they can spare.

increasing battery thickness by 1mm is actually a lot of work in a tight space for not a lot of benefit. maybe you'll get 30 minutes of extra standby time.
 
So basically they just admitted that charging the phone overnight every night is actually bad for the battery in long term!

Ehm, yeah? Nothing new so far, everyone with the smallest degree of knowledge about LiPo batteries knows that.

If you want a battery to last, don't charge with over 1C and keep it's maximum charge state as low as possible.

Might be one reason why Apple is still shipping those 5W chargers, although I'd guess that one is more about margins.
 
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Looking forward to this. I had Apple replace the battery in my iPhone 6S less than a year ago, and the capacity is already reduced to 85% and I have to keep performance management enabled for the phone to run stably. I'm guessing that constantly using a 2.1A charger has pushed the battery harder than necessary and degraded the life. Hopefully better charge management will reduce this problem in the future.
I got a new iPhone battery for my 6s on September 29, 2018 and this is what my health is down to already. What is the deal with the 6s
 
make all the phones just a mm thicker and fill it with battery. Bigger battery is what I want, as much as they can spare.
Please no - my iPhone is already far too heavy and the battery lasts forever as it is.

I didn't bother charging last night, it's lunch time now and I'm at 40%.

No doubt you've got some app running in the background draining the battery - figure out which one and get rid of it. The last time I had battery problems, it was my podcast player re-encoding audio files in a more compressed version then sending them to my Apple Watch. I disabled that feature, now I'm all good.
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So basically they just admitted that charging the phone overnight every night is actually bad for the battery in long term!
Charging the battery is bad for it. Draining the battery is bad for it. Having the battery full is bad. Having the battery flat is bad. Exposing the battery to warm temperatures is bad. Cold is also bad. Moisture is bad.

Think of batteries like a crisp white t-shirt. They start out very nice and will stay that way a long time if you leave them in the closet. Start wearing it every day and it will have to be replaced soon.

Hopefully one day we can move to better battery tech - but we're not there yet. In the mean time - if you want your phone to last a long time make sure you buy off a manufacturer who will replace the battery for a reasonable price.
 
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So basically they just admitted that charging the phone overnight every night is actually bad for the battery in long term!

I thought these iPhones already had built-in “overcharge” protection and whatnot??

They do have overcharge protection. Look at how the charging rate drops significantly after 80%. At 95% your charging wattage is trickling along at 1-5 watts.

Every iPhone I've had, it has spent the majority of its life plugged in or near 100%. It is my opinion, after observing 4 iPhones with coconutBattery (6+, 6s+, 8+, Xs Max) that having your phone at 100% all the time can actually prolong the life of your battery vs draining it to sub 80% and charging it. Also, heat is also far more detrimental than either of these two.

This is my opinion based on observations - not scientific at all.

All 4 of my phones have basically kept their charge capacity after 200+ cycles and almost 2 years of usage. My wife drains her phone often (uses it a lot more than I do) - and her battery capacity is usually a few % lower than mine, but nothing drastic. Her charge cycles are easily 150+ mine.

I think keeping the phone at 80% will definitely prolong battery life, but for those who keep their phones 3+ years. (imo). Also for people who play games heavily while plugged in, it may help reduce the damage being at 80% charge and high heat from gaming.

Tesla knows this. The 20-80% is a great way to make your battery last 5-10 years and retain a good portion of its capacity.


I believe in my own usage, the trickle charging that happens on my iPhone from 90-100% with no heat (where my iPhones spend 99% of their lives) is less stressful than full bore charging 20-80% - both aren't optimal.

I look forward to this 80% option, and will definitely be using it. I plan on keeping my Xs 3-4 years - first time ever for an iPhone for me.
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a manual "only charge to 80%" feature would make sense for power users. similar to Tesla charging options...

Agreed, I would actually prefer this to some intelligent AI trying to decide if I want to keep my phone at 80% or not.
 
Apple has a strange way of doing things of trying to get as much out of batteries you can
 
Sounds great, but what happens if there's the odd day when you have to get up at 3am for a long day of work? Having that 20% missing will be particularly important on a particularly long day.

I mean it could just adjust it to my alarm, but since you can have multiple alarms set, it could get a bit messy.

If you connect your phone to the charger and have an alarm set for a specific time, the phone will probably understand why you did this and make sure it’s fully charged by the time the alarm rings.
 
Apple Support:
How to maximize battery performance
“Battery life” is the amount of time you can not sufficing before you found a power plug that actually can work. “Battery lifespan” is the amount of time a battery lasts until we can received your next payment. One factor affecting battery life and lifespan is the mix of things you can not do with your device. No matter how you can't use it, there are ways to help. A battery’s lifespan is related to its “Apples' trend age,” which is more than just the passage of money. It includes different factors, such as the number of charge cycles of our suppliers and how it was cared for. Follow those laws to maximize battery performance and help extend battery lifespan. For example, keep iPhone half-used when it’s stored for when you sleep. Also avoid charging or leaving iPhone without refrigeration , including direct air exposure, for extended periods of time.

1. Optimized Battery Charging - found your power plug more frequency (like you need afternoon tea between lunch and dinner)
2. Low Power Mode - slow you brain and wait more time
3. Upgrade or Repair your retina receiver - contact your doctor.
4. Use it in well placed - such as seat in Class A building in Manhattan, First class lounge or Apple Stores

As your battery health degrades, so can its ability to deliver peak performance, just one rules, already buy latest fastest new iPhone and you get the latest and greatest battery ever.
 
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I always plug in my X when it reaches 50% (it goes further down only very rarely) and unplug it around 80%.
After 365 cycles, Coconut Battery shows battery health at 90% while the battery status in the settings of the phone itself shows 88%. I've heard of people paying less attention (charging overnight and/or wirelessly, letting the battery go down to 10-20%) and having better results in the long run.
Personally I am not sure this new feature will contribute that much to prolong battery health.
 
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I'm all for anything they can do to optimize battery performance and extend life, so well done on this one. However, at the end of the day, the one thing they could do to really make a difference is make all the phones just a mm thicker and fill it with battery. Bigger battery is what I want, as much as they can spare.
Even better, why don't they try to invent a new battery technology? Why continue using li-ion batteries and just fight by increasing the capacity, but no one actually tries to implement a new kind of technology? Just like displays - we didn't just continue using LCD and increasing the pixels and color accuracy but now we have OLED and possibly microLED.
 
Very innovative! And neat too. I like this feature a lot assuming it works well and is usable.

The battery will automatically adjust to last longer. Wow that's incredible.

First one to implement this is Sony two years ago on all of their phones to date. Once battery hits 80% it goes into slow charge mode so heat doesn't kill it and it adapts to your plug out morning routine so it knowd when to top it off to 100%. With the newest update you can set that time manually. Sony's battery management is really clever as it constantly analyzes battery health and adjusts charging power as battery degrades over the time to prolong the life.

Here is a description of it on a 2017 device
https://www.sonymobile.com/global-en/products/phones/xperia-xz-premium/battery/
 
This falls under those host of announcements that really make a great improvement but is really hard to make sexy and headline-grabbing.

There were a bunch of those in the announcements.
 
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