Become a MacRumors Supporter for $25/year with no ads, private forums, and more!

Battery Maximum Capacity dropped 2% in 2 weeks on iOS 14

RN17

macrumors newbie
Original poster
Sep 21, 2020
13
5
Since updating my 2 months old SE 2020 to 14 and subsequently 14.0.1, the battery Maximum Capacity has dropped from 99% to 97% in less than 2 weeks.

Has anyone else experienced this? I took care when it comes to charging (20% to 80%), and it's shocking see this while other users report 100% after almost an year of use.
 

Trader05

macrumors regular
Sep 16, 2014
103
42
I just upgraded to iOS 14 on my 11 Pro. I've owned it the past year and have 99% health. I have optimized charging off and leave my phone on the charger (using the official charger) over night. In the past month or two i started leaving my phone off the charger overnight if i have 50% or above left over.

I'm curious if these percentages are going down faster for people that are using wireless charging or 3rd party chargers/cables?

I'll keep my eye out to see if it changes in the upcoming weeks.
 
  • Like
Reactions: RN17

RN17

macrumors newbie
Original poster
Sep 21, 2020
13
5
I've only used the cable charger that came in the box, which is the standard one I think, not the fast type.
 
  • Like
Reactions: Trader05

chabig

macrumors 604
Sep 6, 2002
7,010
4,237
The battery capacity number is for entertainment purposes only. It’s not a precise number that holds any special meaning. It could go up to 98% tomorrow and down to 96% the next day. Don’t obsess over it.
 
Last edited:

CoronaOnTap

macrumors 6502
Oct 24, 2019
348
190
I just upgraded to iOS 14 on my 11 Pro. I've owned it the past year and have 99% health. I have optimized charging off and leave my phone on the charger (using the official charger) over night. In the past month or two i started leaving my phone off the charger overnight if i have 50% or above left over.

I'm curious if these percentages are going down faster for people that are using wireless charging or 3rd party chargers/cables?

I'll keep my eye out to see if it changes in the upcoming weeks.
Why would you deliberately turn off Optimized Charging?
 

vertical smile

macrumors 603
Sep 23, 2014
5,214
6,101
Since updating my 2 months old SE 2020 to 14 and subsequently 14.0.1, the battery Maximum Capacity has dropped from 99% to 97% in less than 2 weeks.

These thing vary quite a bit from one day to the next, and I wouldn't be surprised if you end up gaining back a percentage or two over the next few weeks.

and it's shocking see this while other users report 100% after almost an year of use.
A lot of stuff goes into this, usage probably plays a much bigger part than charging habits.

A good example is the difference between my wife's SE1 and my SE1. We got them the same time, but the usage is very different between the two phones.

We got our phones at the same time a little over a year ago, I am at 97% capacity, and she is at 87%.

I averaged 36 minutes of screen time a day last week. I am unsure what my wife averaged, but she is constantly on her phone, so I suspect that is it much higher. Probably 4+ hours a day.


Why would you deliberately turn off Optimized Charging?
It only works well when someone is on a schedule that they routinely stick to. If they deviate from their schedule they risk starting their day with 20% less of a charge.

I have it turned off, as it wouldn't help me at all with my schedule.
 
  • Like
Reactions: chabig and RN17

abelpinate

macrumors newbie
Jun 26, 2020
22
14
Since updating my 2 months old SE 2020 to 14 and subsequently 14.0.1, the battery Maximum Capacity has dropped from 99% to 97% in less than 2 weeks.

Has anyone else experienced this? I took care when it comes to charging (20% to 80%), and it's shocking see this while other users report 100% after almost an year of use.

The same happened to me, with the same phone. The day before update to 14, battery went to 99%... and usage was horrible. I downgrade to 13.7 and yesterday (I think) dropped to 98%...

I do the same 20-80%... original cable and charger... so really don't know.
 

BrightCanon

macrumors 6502
Jul 22, 2008
399
89
Mine 11 was 100% last week. This week 95%. So bizarre. I’m sending this phone back in the 1up program next week so I’m not too worried but if I wasn’t I wouldn’t be happy.
 

MacCheetah3

macrumors 6502a
Nov 14, 2003
653
158
Central MN
I suggest calibrating. I know Apple formerly stated to do it once a month or so but I can’t find the article now. Perhaps they feel their smart features compensate enough.

 

CoronaOnTap

macrumors 6502
Oct 24, 2019
348
190
I suggest calibrating. I know Apple formerly stated to do it once a month or so but I can’t find the article now. Perhaps they feel their smart features compensate enough.

Calibration doesn’t do anything to the Battery Health. It just enables iOS to measure the battery “level” more accurately during your use in the day.
 

aphexacid

macrumors 6502a
Jul 31, 2007
931
20
Chicago
I haven’t had mine for a year yet, and it was 100% before I installed 14. It’s it went to 97% now 🤷🏻‍♂️
 

MacCheetah3

macrumors 6502a
Nov 14, 2003
653
158
Central MN
It actually does!
I misspoke in vagueness. What I should have said is it can't hurt any more than partial/shallow charging. It doesn't harm a Li-ion battery to get down to 5% or be charged to 98-100%. What can hurt is remaining at those extreme ranges for long periods, hence why Apple's battery optimization feature will limit the charge to 80% if a user leaves their iDevice connected to a power (charging) source for an extended period. If you do need to leave a Li-ion battery unused for long periods, it's recommended to have it about 50% charged and stored on the cooler side of the preferred temp spectrum.

There is one more thing...
To get the most out of lithium-ion batteries, you need to use it often so that the electrons in the Lithium batteries are always in a flowing state. If you do not use lithium batteries often, please remember to complete a charging cycle every month and do a power calibration, i.e. deep discharge and deep charge, once.
It's this aspect that I believe -- though open to proof otherwise -- someone who has their device's battery charge range, for example, stay between 50% and 80% has a possibility of not 'working' the cells enough. That aside, I have witnessed the destructiveness of leaving a Li-ion battery unused, and it is most certainly far more harmful than whether a device is typically shallow/partial or deep/fully charged.

So, to circle back, calibration isn't problematic if done properly.
 

Isamilis

macrumors 6502a
Apr 3, 2012
801
158
Since updating my 2 months old SE 2020 to 14 and subsequently 14.0.1, the battery Maximum Capacity has dropped from 99% to 97% in less than 2 weeks.

Has anyone else experienced this? I took care when it comes to charging (20% to 80%), and it's shocking see this while other users report 100% after almost an year of use.
I experienced the same. My battery is 99% in 14.0.1 (2 days ago). After update to 14.1 today, it become 96%.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.