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KevinRightWing

macrumors 6502
Original poster
Jul 15, 2007
269
31
Houston TX
Am I the only one who doesn’t wait until battery health reaches 80% before replacing their battery? I notice such a difference from 100% out of the gate to 89% where I am now. Curious if anyone else does this early.
 
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Helmsley

macrumors 6502a
Sep 4, 2017
715
345
Yorkshire, United Kingdom
It depends how much of a difference you notice, I guess, and how it affects your device usage.

My iPhone 11 was on 88% when I replaced it with an iPhone 13. I noticed a bit of a drop in battery life, as expected, but it didn't cause my any issues.
 
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BugeyeSTI

macrumors 604
Aug 19, 2017
6,892
8,748
Arizona/Illinois
I replaced my 6S battery at 86% because Apple offered it for $29 so I didn't notice any difference in performance. I had Apple replace my X battery at 82% (service battery notification was on) and it gave my X new life.. Definitely makes a difference if the battery has considerable deterioration...
 

chrfr

macrumors G5
Jul 11, 2009
13,549
7,077
Am I the only one who doesn’t wait until battery health reaches 80% before replacing their battery? I notice such a difference from 100% out of the gate to 89% where I am now. Curious if anyone else does this early.
My 13 Pro battery was down to 84% when I paid to have it replaced and the phone works much better now.
 

Andeddu

macrumors 68000
Dec 21, 2016
1,657
2,052
I would definitely replace my iPhone 13’s battery once it’s down to 90% or below. Once you’re around 84% or less the phone becomes unusable. My 6S had 83% before I got it replaced and would only have 1.5 hours of SoT which rendered the device pretty useless.
 

Ameer_1

macrumors 6502
Jul 29, 2023
323
487
Boca Raton, Florida
I'm thinking about joining the Apple iPhone upgrade program this September does anyone know if it'll be a problem if I used the phone too much and it went down to lets say 81% battery health will apple replace it since I'm under the iPhone upgrade program or will it be a problem after I return the phone after 12 months before getting the new iPhone
 

JiggyJaggy

macrumors 6502
Sep 17, 2020
364
306
Anyone know the cost of replacing the battery outside of warranty before it hits 80% in the UK specifically?
 

FeliApple

macrumors 68040
Apr 8, 2015
3,667
2,058
I’ll never replace a battery. It’s not necessary on original iOS versions.
 
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Andeddu

macrumors 68000
Dec 21, 2016
1,657
2,052
I’ll never replace a battery. It’s not necessary on original iOS versions.
Your batteries will go bad and expand causing damage to your electronics if you never replace or remove them.

Marques Brownlee did a video on some old phones a while back and realised the majority of his collection from 2010-2013, which were stored in a drawer, had been damaged due to the lithium ion batteries expanding causing the rear case to bend and crack.
 
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smirking

macrumors 68040
Aug 31, 2003
3,774
3,758
Silicon Valley
I generally won't replace any battery until it's way below 80%, but it does seem to be the case that once they drop below 90%, they become much less resilient.

What I mean is if I get 10 hours at 100%. I don't get 9 hours at 90%. I might only get 8 hours at 90%.

Either this is actually the normal pattern of degradation or battery health tends to over estimate the health of the battery the further away from 100% we get.
 

FeliApple

macrumors 68040
Apr 8, 2015
3,667
2,058
Your batteries will go bad and expand causing damage to your electronics if you never replace or remove them.

Marques Brownlee did a video on some old phones a while back and realised the majority of his collection from 2010-2013, which were stored in a drawer, had been damaged due to the lithium ion batteries expanding causing the rear case to bend and crack.
Whenever that happens I’ll let you know. 10+ year-old devices are fine.
 

JPack

macrumors G5
Mar 27, 2017
12,782
23,974
Apple doesn't provide a battery health % in iOS. Rather, it's battery capacity that is being estimated.

As the battery degrades, capacity diminishes and internal resistance increases. The resistance is what causes unexpected shutdowns, especially in cold weather. This is why Apple slows down the phone if the battery is degraded - to prevent power demand spikes.

Overall, you'll get a better experience replacing when you're near 500 cycles rather than waiting for the battery capacity % to drop to 80%.
 

Gourik31

macrumors member
Nov 12, 2020
39
8
Hmm interesting thread. I find my 14 pro getting stutters etc. Now I consider it can be caused due to the battery. Used the phone for 8 months and im at 91% capacity. Battery usage is miserable now. I leave the phone over night at 100% and in 8 hours while I sleep it uses 90ish %. I wake up always to 7-10% battery left.
 
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