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Galacticos

macrumors 6502a
Apr 5, 2016
692
379
Warm is okay. If it gets hot to the touch then I would unplug it. Let if cool off before resume charging. I try to avoid heavy game play while charging as that increases heat.

Yeah I don't do anything intensive. Sometimes charging alone warms the phone up
 

deano1972

macrumors 6502a
Sep 16, 2016
557
239
United Kingdom
Yeah I don't do anything intensive. Sometimes charging alone warms the phone up
I noticed this the last time I charged my faulty launch day iPhone 7 up before taking it back to the Apple Store, the phone was very warm at the back while charging and it was switched off at the time. So far this replacement iPhone 7 hasn't got noticeably warm on charge or in general use yet.
 

Galacticos

macrumors 6502a
Apr 5, 2016
692
379
I was just wondering what the solution is to phone battery that is badly calibrated. My iPhone 7 has had over 10% of its battery at or above 100%. That is over an hour of usage before it goes to 99%.

How should I calibrate the battery?
 

deano1972

macrumors 6502a
Sep 16, 2016
557
239
United Kingdom
I was just wondering what the solution is to phone battery that is badly calibrated. My iPhone 7 has had over 10% of its battery at or above 100%. That is over an hour of usage before it goes to 99%.

How should I calibrate the battery?
If you haven't already I would run the battery from 100% down to 1% during normal use. Ok it's not particularly good for batteries to run them down low, but its a bit of a catch 22 as it can help with calibration. It won't do any harm doing this just occasionally if you usually charge your phone before the battery gets low.

Usually you get the equivalent of around 5% battery before they drop to 99%. From a full charge my iPhone 7 usually does around 40 minutes useage sitting on 100%

Cheers
 
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newellj

macrumors G3
Oct 15, 2014
8,127
3,030
East of Eden
I take it a cycle is just 100% of use no matter where it happens on the battery span? Eg 100-40% and then 80-40% is one cycle

Just to make that super-clear, the answer is yes because 100%->60% = 60% and 80% -> 40% = 40% for a total of 100%, or one cycle.
[doublepost=1482944608][/doublepost]
If you haven't already I would run the battery from 100% down to 1% during normal use. Ok it's not particularly good for batteries to run them down low, but its a bit of a catch 22 as it can help with calibration. It won't do any harm doing this just occasionally if you usually charge your phone before the battery gets low.

Usually you get the equivalent of around 5% battery before they drop to 99%. From a full charge my iPhone 7 usually does around 40 minutes useage sitting on 100%

Cheers

Yes to this...Li cells do not like to be hammered: run down to very low or charged up to very high amounts. An occasional run down to 5% or what the phone sees as 0% is not going to be a long term issue but I wouldn't do it often.

The other side of this is that most of us replace phones before this becomes an issue. My older (28 yo) son has an iPhone 5 that really has got battery issues, but it's been used continually for four years and at this point neither the phone (economically speaking) nor the battery (chemically speaking) owes him a nickel.
 

Galacticos

macrumors 6502a
Apr 5, 2016
692
379
Just to make that super-clear, the answer is yes because 100%->60% = 60% and 80% -> 40% = 40% for a total of 100%, or one cycle.
[doublepost=1482944608][/doublepost]

...Li cells do not like to be hammered: run down to very low or charged up to very high amounts.

What do you mean by very high? are the aforementioned protective mechanisms there to prevent charging 'too high'
 

krishmk

macrumors 6502
Original poster
Feb 11, 2010
440
191
Battery life app or connect your iPhone to mac, launch coconut battery.
 

newellj

macrumors G3
Oct 15, 2014
8,127
3,030
East of Eden
What do you mean by very high? are the aforementioned protective mechanisms there to prevent charging 'too high'

For longest service life, Li cells should not be fully charged. Optimum service life is achieved at lower charge states, although this is generally unacceptable to users because of the limitations on runtime.
 

Galacticos

macrumors 6502a
Apr 5, 2016
692
379
For longest service life, Li cells should not be fully charged. Optimum service life is achieved at lower charge states, although this is generally unacceptable to users because of the limitations on runtime.

I thought this was right.. but mlrollin91 suggested not unplugging until fully charged
[doublepost=1483195958][/doublepost]
I never let the battery drop below 20% unless an emergency. I never unplug the battery unless it's fully charged. So I won't plug in for 20 minutes then unplug. I also don't constantly keep my phone at 100% I use the battery. I also make sure not to let it overheat or get too cold. I'm very particular about my battery health but it is clearly paying off. 4 months and still over 100%.
 

Mlrollin91

macrumors G5
Nov 20, 2008
14,120
10,106
I thought this was right.. but mlrollin91 suggested not unplugging until fully charged
[doublepost=1483195958][/doublepost]

Fully charging is fine. They should not intentionally be kept at or near 100% all the time. That adds stress to the battery. If you were to charge from 75-100% 3 times a day, that would be bad. But one charge from 25-100% would be better
 

C DM

macrumors Sandy Bridge
Oct 17, 2011
51,390
19,458
Fully charging is fine. They should not intentionally be kept at or near 100% all the time. That adds stress to the battery. If you were to charge from 75-100% 3 times a day, that would be bad. But one charge from 25-100% would be better
Why would that be bad? Simply because you are at 100% a few times vs. once? I mean it probably wouldn't be as good, but I don't think that would be bad really (perhaps short of doing it essentially continuously day after day).
 

Mlrollin91

macrumors G5
Nov 20, 2008
14,120
10,106
Why would that be bad? Simply because you are at 100% a few times vs. once? I mean it probably wouldn't be as good, but I don't think that would be bad really (perhaps short of doing it essentially continuously day after day).

When you constantly keep the battery over 80% it causes stress. This stress reduces the health capacity over time. So if you constantly keep your phone between 75-100% you are adding unnecessary stress to the battery. Lithium ion batteries are best kept between 20-80%. Even as others stated above, your shouldn't even fully charge the battery (reach 100%), but fully charging it once instead of 4 times is going to be better for it.
 

SumYoungGai

macrumors 65816
Jun 11, 2013
1,156
1,245
SF Bay Area, CA
I plug in my phone whenever I'm at home, and leave it plugged in overnight/when I'm working on the computer.

Received my 7+ 3 months ago, still 100% capacity.
 

Galacticos

macrumors 6502a
Apr 5, 2016
692
379
Lithium ion batteries are best kept between 20-80%. Even as others stated above, your shouldn't even fully charge the battery (reach 100%), but fully charging it once instead of 4 times is going to be better for it.

This is what I originally thought. I don't make particular effort but charge between 20-80ish plugging in my phone sometimes several times in a day without going to 100
 

Galacticos

macrumors 6502a
Apr 5, 2016
692
379
I noticed this the last time I charged my faulty launch day iPhone 7 up before taking it back to the Apple Store, the phone was very warm at the back while charging and it was switched off at the time. So far this replacement iPhone 7 hasn't got noticeably warm on charge or in general use yet.
This quite rarely has happened for me. I think it's happened at one time or another on all the phones I've had. Maybe just a process that's running in the background at the time. It annoys me but I don't think it's anything particularly out of the ordinary
 

nickelro

macrumors regular
Nov 11, 2013
105
53
Need to bump up this thread because there were more than 6 months since the last post.
So here I go: about a week ago I noticed that my 7 months old 7+ started to read 2800mAh/2900mAh as maximum capacity (3% wear level) in Battery Life.
Are there any early 7+ adopters around who mind checking their current wear level and share their findings with the rest of us?
Thanks!
 

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PNutts

macrumors 601
Jul 24, 2008
4,874
357
Pacific Northwest, US
Need to bump up this thread because there were more than 6 months since the last post.
So here I go: about a week ago I noticed that my 7 months old 7+ started to read 2800mAh/2900mAh as maximum capacity (3% wear level) in Battery Life.
Are there any early 7+ adopters around who mind checking their current wear level and share their findings with the rest of us?
Thanks!

As mentioned earlier in this thread, Battery Life is no longer accurate due to iOS changes. Yours will read 2800 until at some point it will change to 2700. Then 2600, etc.
 

gobikerider

Suspended
Apr 15, 2016
2,022
1,478
United States
As mentioned earlier in this thread, Battery Life is no longer accurate due to iOS changes. Yours will read 2800 until at some point it will change to 2700. Then 2600, etc.
So those apps aren't accurate? I thought that was the case but couldn't honestly remember
 

QueenTyrone

macrumors 6502a
Sep 21, 2016
910
1,080
Need to bump up this thread because there were more than 6 months since the last post.
So here I go: about a week ago I noticed that my 7 months old 7+ started to read 2800mAh/2900mAh as maximum capacity (3% wear level) in Battery Life.
Are there any early 7+ adopters around who mind checking their current wear level and share their findings with the rest of us?
Thanks!


Here's mine, but Its probably not accurate
b3f7914694e90ff8c15c1bbdf804d5dd.png
 

nickelro

macrumors regular
Nov 11, 2013
105
53
battery cycle count: 204
iPhone 7

Thanks for sharing your findings. I assume you have the cycle count from Coconut, right?

As mentioned earlier in this thread, Battery Life is no longer accurate due to iOS changes. Yours will read 2800 until at some point it will change to 2700. Then 2600, etc.

I think iOS 10 battery specific APIs only affected the access to the cycle count. More than that, since I performed a calibration on my battery, its capacity is back to 2900 mAh ("Perfect" state, 0% wear), so at least in my case two of these iOS apps that I use seems accurate enough.

Here's mine, but Its probably not accurate
b3f7914694e90ff8c15c1bbdf804d5dd.png
Thanks! What device / iOS are you on?
 
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