iPhone 11 Pro iPhone 11 Pro Battery Health

Kar Hou

macrumors newbie
Original poster
Jan 31, 2020
9
3
Malaysia
I just bought an iPhone 11 Pro last year September. Then after two months (November 2019) of using, my iPhone 11 Pro's battery health dropped until 95% with normal using (one day one charge). Then I went to Apple Authorized Shop to repair. After a few days, Apple changed a new iPhone 11 Pro with different IMEI number. Then after another two months of using, now my new iPhone 11 Pro's battery health again dropped to 96%. I was wondering what is the problem? I understand that battery is kind of a degrading stuff following by the days of using. Is it the 18W fast charger hurt battery? FYI, I had been using Apple's product for few years. My last iPhone SE does not have this kind of problem. Anyone can suggest? And can anyone tell me how much is yr iPhone 11 Pro battery health? Thank you very much.
IMG_B90460B167B2-1.jpeg
 
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808drums

macrumors member
Dec 28, 2017
70
39
I just bought an iPhone 11 Pro last year September. Then after two months (November 2019) of using, my iPhone 11 Pro's battery health dropped until 95% with normal using (one day one charge). Then I went to Apple Authorized Shop to repair. After a few days, Apple changed a new iPhone 11 Pro with different IMEI number. Then after another two months of using, now my new iPhone 11 Pro's battery health again dropped to 96%. I was wondering what is the problem? I understand that battery is kind of a degrading stuff following by the days of using. Is it the 18W fast charger hurt battery? FYI, I had been using Apple's product for few years. My last iPhone SE does not have this kind of problem. Anyone can suggest? And can anyone tell me how much is yr iPhone 11 Pro battery health? Thank you very much.
Maybe your usage habits
 
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Kar Hou

macrumors newbie
Original poster
Jan 31, 2020
9
3
Malaysia
Maybe your usage habits
So, may I know how u guys charged yr iPhone? Last time I charged my iPhone when the battery percentage dropped below 20% as I do this when I was using iPhone SE. After that, I had read some articles about iPhone battery, then I changed my habit become I will just plug in the charger when I nearby an iPhone charger. But it still not help. What should I do?
- - Post merged: - -

Got mine in September still 100%, your doing something wrong.

View attachment 891670
May I know how u charged yr iPhone? I mean how often u charged yr iPhone, or when will u charged yr iPhone? Will u overcharged?
 

bobsamm

macrumors 65816
Oct 6, 2019
1,018
620
So, may I know how u guys charged yr iPhone? Last time I charged my iPhone when the battery percentage dropped below 20% as I do this when I was using iPhone SE. After that, I had read some articles about iPhone battery, then I changed my habit become I will just plug in the charger when I nearby an iPhone charger. But it still not help. What should I do?
- - Post merged: - -


May I know how u charged yr iPhone? I mean how often u charged yr iPhone, or when will u charged yr iPhone? Will u overcharged?
I use a Samsung wireless charger, if low overnight, or sometimes just top up Once during the day. Never really drops below 40% before I charge.
 

tonybarnaby

macrumors 68000
Dec 3, 2017
1,925
1,359
Where do you live? My guess is that heat might play a factor, since one cycle a day is far from extreme.
 

CoronaOnTap

macrumors regular
Oct 24, 2019
204
119
So, may I know how u guys charged yr iPhone? Last time I charged my iPhone when the battery percentage dropped below 20% as I do this when I was using iPhone SE. After that, I had read some articles about iPhone battery, then I changed my habit become I will just plug in the charger when I nearby an iPhone charger. But it still not help. What should I do?
I’ve only ever charged with the 18W Charger unless I don’t have access to one and I got my 11 Pro on the launch day. I charge whenever I feel like it and it’s currently at 99%. I am who you’d call a heavy user with more time spent on my iPhone than on my laptop for most.
 

Pipinou83

macrumors newbie
May 26, 2019
15
3
My XR stayed at 100% for 10 months.

And now with my Pro max, with the same habits which are supposed to be good for the battery (no charge overnight, almost never below 50%, don’t exceed 80/90% and no wireless)...It stands at 98% after 4 months.

I don’t get it. I start wondering if there is really a “way” to take care of a battery.
 

cynics

macrumors G4
Jan 8, 2012
11,506
1,832
Preface, I always advice just using the device and enjoying it. Too worry about the battery will only limit your usage and thus your enjoyment of the device.

My iPhone 11 Pro Max is still at 100%. I use a 5v 2.4amp charging station most of the time. This is slow charge compared to using the included charger or a mac/mac charger. Charging slower is generally cooler and less stressful for the battery. Note, I use this charging station for convenience not battery health....

That said battery health measured as a % is arbitrary and just an educated guess based on metrics that aren't stable reference points. Its hard to say its an "educated" guess, more of a guess based on hardware knowledge and experience.

Keep in mind this is just Apples way of having more disclosure for hardware throttling in a way the consumer can easily read. As batteries get old there internal resistance increases. As the resistance increases in a battery, heavy loads can cause the battery voltage to dip more and more until eventually it will dip below the shut down threshold before its useable energy is expended (ex phone shuts down at 20%). Throttling the hardware performance will reduce higher current loads and keep the voltage from dropping.

If you ever plugged in a heavy duty appliance and/or tool and the lights in the room dim momentarily when it turns your visually seeing the voltage drop due to energies inability to more/flow fast enough due to resistance somewhere (wire gauge, loose connection in the wall/panel box, etc). This manufactured brown out isn't healthy for electronics and/or batteries (lithium).

We dont know Apples method of obtaining battery health. There are a dozen(s) metrics (impedance, conductance, initial capacity, cycle count, load/temp, etc etc etc) which can be used independently and/or combined.

Your usage and temp conditions the phone is used in can positively or negatively effect battery health when its captured in arbitrary 1% slices. For example if only impedance was used then using/charging your phone at 30 degrees F for extended periods of time will actually degraded battery health and a battery meter will greatly exaggerate the degradation because of higher internal resistance. However if only cycle count is used than using/charging your phone in 30 degree weather will have no effect on the battery at all. Accurately combining those metrics can never result in 100% accuracy. Hence why I said its arbitrary and just an educated guess.

TL;DR - I know its difficult but just ignore battery health unit the warranty is about to expire so you can check if they should replace it.

Side note, many NON OEM batteries are programmed to always read 100%. This is my iPhone 6S with a 2 year old battery that I replaced.

IMG_0289.jpg

I can say from experience this isn't a good thing. It last 3-4 hours with light usage and a heavy load like a AR kit usage will make the phone HOT and make it shut down at ~30%. Its useless, I would gladly take some throttling in this case.
 
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Kar Hou

macrumors newbie
Original poster
Jan 31, 2020
9
3
Malaysia
Where do you live? My guess is that heat might play a factor, since one cycle a day is far from extreme.
I am from Malaysia. I just started work at a high temperature factory since two months ago. I also try to prevent my iPhone to get into the extreme environment.
- - Post merged: - -

My XR stayed at 100% for 10 months.

And now with my Pro max, with the same habits which are supposed to be good for the battery (no charge overnight, almost never below 50%, don’t exceed 80/90% and no wireless)...It stands at 98% after 4 months.

I don’t get it. I start wondering if there is really a “way” to take care of a battery.
That's why I was wondering is the 18W fast charger hurt battery health. I will more prefer that Apple don't make the battery health feature in the Settings. So that I wouldn't care about the percentage.
- - Post merged: - -

Preface, I always advice just using the device and enjoying it. Too worry about the battery will only limit your usage and thus your enjoyment of the device.

My iPhone 11 Pro Max is still at 100%. I use a 5v 2.4amp charging station most of the time. This is slow charge compared to using the included charger or a mac/mac charger. Charging slower is generally cooler and less stressful for the battery. Note, I use this charging station for convenience not battery health....

That said battery health measured as a % is arbitrary and just an educated guess based on metrics that aren't stable reference points. Its hard to say its an "educated" guess, more of a guess based on hardware knowledge and experience.

Keep in mind this is just Apples way of having more disclosure for hardware throttling in a way the consumer can easily read. As batteries get old there internal resistance increases. As the resistance increases in a battery, heavy loads can cause the battery voltage to dip more and more until eventually it will dip below the shut down threshold before its useable energy is expended (ex phone shuts down at 20%). Throttling the hardware performance will reduce higher current loads and keep the voltage from dropping.

If you ever plugged in a heavy duty appliance and/or tool and the lights in the room dim momentarily when it turns your visually seeing the voltage drop due to energies inability to more/flow fast enough due to resistance somewhere (wire gauge, loose connection in the wall/panel box, etc). This manufactured brown out isn't healthy for electronics and/or batteries (lithium).

We dont know Apples method of obtaining battery health. There are a dozen(s) metrics (impedance, conductance, initial capacity, cycle count, load/temp, etc etc etc) which can be used independently and/or combined.

Your usage and temp conditions the phone is used in can positively or negatively effect battery health when its captured in arbitrary 1% slices. For example if only impedance was used then using/charging your phone at 30 degrees F for extended periods of time will actually degraded battery health and a battery meter will greatly exaggerate the degradation because of higher internal resistance. However if only cycle count is used than using/charging your phone in 30 degree weather will have no effect on the battery at all. Accurately combining those metrics can never result in 100% accuracy. Hence why I said its arbitrary and just an educated guess.

TL;DR - I know its difficult but just ignore battery health unit the warranty is about to expire so you can check if they should replace it.

Side note, many NON OEM batteries are programmed to always read 100%. This is my iPhone 6S with a 2 year old battery that I replaced.

View attachment 891717

I can say from experience this isn't a good thing. It last 3-4 hours with light usage and a heavy load like a AR kit usage will make the phone HOT and make it shut down at ~30%. Its useless, I would gladly take some throttling in this case.
First of all, thanks for your reply. I also had replaced my old iPhone SE battery. And it results my iPhone SE will sudden shutdown at 50% which same as yr iPhone 6s case. I will try to keep my eyes close at the battery health. This is really a failure feature (Battery Health) ever that I feel using iPhone.
 
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Kar Hou

macrumors newbie
Original poster
Jan 31, 2020
9
3
Malaysia
I’ve only ever charged with the 18W Charger unless I don’t have access to one and I got my 11 Pro on the launch day. I charge whenever I feel like it and it’s currently at 99%. I am who you’d call a heavy user with more time spent on my iPhone than on my laptop for most.
I really don't know what happened to my iPhone 11 Pro. I almost used it same as you. But the battery health keep dropping.
 

CoronaOnTap

macrumors regular
Oct 24, 2019
204
119
I really don't know what happened to my iPhone 11 Pro. I almost used it same as you. But the battery health keep dropping.
Have you actually noticed any difference in the battery life itself? Cuz if you don’t then I’d say not to worry too much about it. They all come with one year warranty so you could swap it out later. Also there have been cases where the battery health had gone up after a couple months of going down. Since it’s only a mere estimation that makes sense.
So I’d advise you to wait and see for a couple months.
 

Kar Hou

macrumors newbie
Original poster
Jan 31, 2020
9
3
Malaysia
Have you actually noticed any difference in the battery life itself? Cuz if you don’t then I’d say not to worry too much about it. They all come with one year warranty so you could swap it out later. Also there have been cases where the battery health had gone up after a couple months of going down. Since it’s only a mere estimation that makes sense.
So I’d advise you to wait and see for a couple months.
OK, thanks for your advice. If I have not mistaken, Apple will change a new iPhone if your iPhone's battery health is drop below 80% within the warranty.
 
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rattler

macrumors regular
Jul 18, 2011
126
22
I wouldn’t put much weight on the battery health readings. My iPhone X stayed at 100% for almost 7 months and my launch day 11 Pro is at 97%. Same charging habits for both, and I haven’t noticed any difference in battery life.
 

aleni

macrumors 68020
Jun 2, 2006
2,154
247
Not 11, but my XS stays at 100% for almost a year and suddenly in the past two months it’s down to 88%. I don’t know why, the usage habit is still the same as before.
 

Kar Hou

macrumors newbie
Original poster
Jan 31, 2020
9
3
Malaysia
Same here, iPhone 11 Pro the battery dropped to 96% after a 4 months of use
Is not exactly the same, mine is within 2 months of using dropped until 96%. Anyway, thanks for sharing.
- - Post merged: - -

Not 11, but my XS stays at 100% for almost a year and suddenly in the past two months it’s down to 88%. I don’t know why, the usage habit is still the same as before.
This is why I said the battery health feature is the most ever failure feature that Apple had implement. And also thanks for sharing.
 
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blackbird666

macrumors newbie
Nov 22, 2019
15
3
Kuwait
My 11 Pro Max is at 99% after 4 months! I charge my device once a day overnight using Samsung wireless charger. Sometimes use my MacBook Pro's 85W charger.
 

Kar Hou

macrumors newbie
Original poster
Jan 31, 2020
9
3
Malaysia
My 11 Pro Max is at 99% after 4 months! I charge my device once a day overnight using Samsung wireless charger. Sometimes use my MacBook Pro's 85W charger.
I have no idea how you guys can have so high battery health after so long of using. I think I really have to purchase a wireless charger. Anyway, thanks for sharing.
 

Jim Lahey

macrumors 6502a
Apr 8, 2014
901
1,606
Sunnyvale
I sometimes think Apple made a rod for their own back by displaying this value. A simple notification warning of impending reduced performance due to battery degradation would probably have been better. In my opinion, too many people obsess over this.

Personally I wouldn't worry. It may remain at 96% for the next year, or it may drop more. There's no way to know. It's not expensive to have the battery replaced anyway. Just enjoy the phone.
 
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UBS28

macrumors 65816
Oct 2, 2012
1,145
394
I have no idea how you guys can have so high battery health after so long of using. I think I really have to purchase a wireless charger. Anyway, thanks for sharing.
I am using the Samsung Wireless charger (as Apple failed to make one), my phone still has 100% battery health.

So if you buy a wireless charger, the one from Samsung is quite good.

The funny thing is, the optimized charging isn’t even working on my phone.
 

Jim Lahey

macrumors 6502a
Apr 8, 2014
901
1,606
Sunnyvale
The funny thing is, the optimized charging isn’t even working on my phone.
It doesn't appear to work on mine either, but I have put this down to very irregular charging patterns making it almost impossible for software to determine when I am likely to remove it from power.
 
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blackbird666

macrumors newbie
Nov 22, 2019
15
3
Kuwait
I am using the Samsung Wireless charger (as Apple failed to make one), my phone still has 100% battery health.

So if you buy a wireless charger, the one from Samsung is quite good.

The funny thing is, the optimized charging isn’t even working on my phone.
How do you know the optimised charging is working or not?
 
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