Battery Health: 95% = "Significantly Degraded?"

i486dx2-66

macrumors member
Original poster
Feb 25, 2013
31
8
Recently upgraded my iPhone SE from iOS 10 to iOS 12, and I'm now seeing this puzzling battery health status:

On the "Battery" page in Settings, it says "Battery Health: Service".
On the Service page, it says:
"Maximum Capacity: 95%"
"Peak Performance Capability"
"Your battery is currently supporting normal peak performance."


... and then ...

"Your battery's health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity." ... with a link to the battery replacement service options.

o_Oo_Oo_O


The phone has had no unexpected shutdowns, and battery life seems good. Any thoughts on why iOS thinks my battery is "significantly degraded" at 95% maximum capacity? Has anyone else encountered this on the iPhone SE?

I've run several dozen charge cycles to see if it figures itself out, but it has not. I've also run it fully down until it powers itself off at 1% and then recharged fully in one shot, to see if that helps it recalibrate, but that didn't do it either.
 
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drlunanerd

macrumors 68000
Feb 14, 2004
1,596
81
UK
There's some weirdness going on with iOS 12 and the iPhone SE. I and others have had battery anomalies with previously healthy phones. Hopefully iOS 12.1 or later will fix this.
[doublepost=1538762723][/doublepost]My battery life percentage was all over the shop at first. Took several days to settle down. Phone turns off at 5%, despite trying to calibrate the battery. Had no battery issues with iOS 11.
 
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AxlTJ

macrumors member
Aug 3, 2018
98
18
Take that with a grain of salt. You can tell if the battery is significantly degraded just by using it normally. If the device still lasts longer then I wouldn't trust that warning. Most probably an update bug or something.
 

Ribbon06

macrumors newbie
Nov 7, 2018
1
1
Recently upgraded my iPhone SE from iOS 10 to iOS 12, and I'm now seeing this puzzling battery health status:

On the "Battery" page in Settings, it says "Battery Health: Service".
On the Service page, it says:
"Maximum Capacity: 95%"
"Peak Performance Capability"
"Your battery is currently supporting normal peak performance."


... and then ...

"Your battery's health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity." ... with a link to the battery replacement service options.

o_Oo_Oo_O


The phone has had no unexpected shutdowns, and battery life seems good. Any thoughts on why iOS thinks my battery is "significantly degraded" at 95% maximum capacity? Has anyone else encountered this on the iPhone SE?

I've run several dozen charge cycles to see if it figures itself out, but it has not. I've also run it fully down until it powers itself off at 1% and then recharged fully in one shot, to see if that helps it recalibrate, but that didn't do it either.
[doublepost=1541587091][/doublepost]Hi! Im experiencing the same thing now. At 100% condition but it says that its significantly degrading. What happen to your phone now?
 
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NJHitmen

macrumors 6502
Oct 8, 2010
330
281
I just saw this “significantly degraded” message for the first time, on my 7. Still on the original battery, at 94% capacity. Very odd
 
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JPack

macrumors 601
Mar 27, 2017
4,660
6,972
I just saw this “significantly degraded” message for the first time, on my 7. Still on the original battery, at 94% capacity. Very odd
[doublepost=1541587091][/doublepost]

Hi! Im experiencing the same thing now. At 100% condition but it says that its significantly degrading. What happen to your phone now?
There are at least 3 measures of battery health.

  1. Capacity, the ability to store energy
  2. Internal resistance, the capability to deliver current, and
  3. Self-discharge, reflecting mechanical integrity and stress-related conditions

Battery capacity at 94% (or 100%) only refers to the capacity to hold a charge.

A battery's internal resistance or impedance also increases with age. The battery may hold the charge, but how quickly the battery can deliver the energy is another factor. A battery is degraded if it can't deliver peak output or if it's unable to hold sufficient capacity.
 
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NJHitmen

macrumors 6502
Oct 8, 2010
330
281
There are at least 3 measures of battery health.

  1. Capacity, the ability to store energy
  2. Internal resistance, the capability to deliver current, and
  3. Self-discharge, reflecting mechanical integrity and stress-related conditions

Battery capacity at 94% (or 100%) only refers to the capacity to hold a charge.

A battery's internal resistance or impedance also increases with age. The battery may hold the charge, but how quickly the battery can deliver the energy is another factor. A battery is degraded if it can't deliver peak output or if it's unable to hold sufficient capacity.
Good info and logical. I don't know what metric the "significantly degraded" message is referring to, but theoretically it isn't capacity.

That said, I'm inclined to think the message is the result of an iOS 12 bug, rather than indicative of an actual problem. The message wasn't there before I updated. But more importantly - I don't seem to be experiencing any battery issues. If the battery was truly "significantly degraded" I assume that would result in some sort of noticeable change or deficiency. And the battery seems to be performing exactly as it did a year ago.
 
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i486dx2-66

macrumors member
Original poster
Feb 25, 2013
31
8
Small update for this thread: Upgrading from iOS 12.0 to 12.1, the conditions are all still the same. If this "service" notice is the result of a bug, they haven't fixed it yet...
 
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i486dx2-66

macrumors member
Original poster
Feb 25, 2013
31
8
So here we are, three weeks shy of a year since I started this thread.

My iPhone SE is now down to 84% battery capacity.

I'm on iOS 12.4.1 now, and the battery messages are all identical to those given with iOS 12.0 a year ago. Still no unexpected shutdowns, and still "supporting normal peak performance", although I can tell that the battery life is shorter.

It's still a puzzle why iOS 12 though that 95% = "significantly degraded"... although as my battery ages, at least it is growing into that description. :rolleyes:

I'll be interested to see if iOS 13 changes anything.
 

i486dx2-66

macrumors member
Original poster
Feb 25, 2013
31
8
... aaaand it happened. Two days ago, I had my very first unexpected shutdown, so now all of the messages have changed.

My SE turned off while attempting to take a photo at 19% battery. Still shows the same 84% capacity rating, but I now have the message that "This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power."


So start to finish, I got a full year of extra usage out of this battery, between when it first started warning me of degradation, and the first actual unexpected shutdown.

I pulled up the iPhone in coconutBattery, and it shows 915 cycles, with a 2016-06-20 manufacture date.

Not too bad, I'd say.