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Original poster
Apr 12, 2001
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With watchOS 9, Apple is adding a new recalibration feature for the Apple Watch Series 4 and Apple Watch Series 5, according to the watchOS 9 release notes. The recalibration will result in a more accurate estimate for maximum battery capacity.

apple-watch-series-5.jpg
After updating to watchOS 9, your Apple Watch Series 4 or Series 5 will recalibrate and then estimate its maximum battery capacity more accurately.
Following the watchOS 9 update, Apple Watch Series 4 and Series 5 owners who have noticed battery life being misrepresented should be able to get a better read on how long their device will last.

Apple has previously introduced recalibration functionality for the iPhone 11 to make iPhone battery life estimates more accurate, but there has been no similar feature made available for the Apple Watch until now.

The recalibration process will happen during the update and will be complete once it's installed.

Article Link: Apple Watch Series 4 and 5 Will Recalibrate Maximum Battery Capacity With watchOS 9
 
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minimo3

macrumors 6502a
Oct 18, 2010
657
639
I don’t think recalibration will change the fact that my 2 year old series 5 barely lasts 12 hours with light usage (battery health reports as 78%). Instead of paying $79 for a new battery I’m getting a G-Shock
 

coffeeplease

macrumors 6502
Sep 28, 2019
421
300
My Series 5 is already 86% just under 1.5 years. Wonder if it'll be higher or lower after recalibration.
 

Relentless Power

macrumors Westmere
Jul 12, 2016
37,620
42,368
I mean, it’s a decent metric for people that want to know the overall health of the battery. However, I doubt most users will probably not pay attention to this feature, as they only seem to care when their Apple Watch is down to sub ~10%, which isn’t also healthy for lithium-ion to reach that low consistently.

On a side note:

I can’t believe we’re already reaching watchOS 9. Seems like yesterday when watchOS was first introduced in the April 2015 launch.
 

MrMojo1

macrumors regular
Aug 25, 2010
209
122
New England
Battery calibration won't help that much for a series 5 with battery <90%.
In another year or 2, it's time to either get a new battery (provided WatchOS still supports S5) or get a new iWatch, most likely the latter, even if the S5 is more than adequate for my basic needs.
If the newer iWatch finally includes something like a blood pressure monitor, then it's possible time for an upgrade.
 
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Gsmaniac

macrumors regular
Apr 3, 2014
171
149
Launch Apple Watch 4 and my battery health is still at 93%. Bet that will mysteriously change for the worse after recalibration.
 

wwooden

macrumors 68020
Jul 26, 2004
2,018
178
Burlington, VT
My Series 4 is at 80% battery health. Doesn't affect any of my day-to-day: I still can workout in the morning, wear it all day at work, and still do more activities in the evening before it starts to get close to 15-20%. When it starts affecting my daily activities, I'll just pay to get the battery replaced. The feature set of the Series 4 meets all my needs.
 

Brandon42

macrumors member
Jul 24, 2019
72
261
My series 4 has been at 81% for months. It suddenly started draining with minimal usage in 12 hours, where before I was getting 24-36 hours. The watch will also shut down at 3-4%. I hope the recalibration works.
 
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kalafalas

macrumors 6502
Aug 26, 2008
468
1,306
California
Ha! my S5 is at the depot for battery wear right now after hitting %79. Battery life was really awful, wouldn’t last half an hour on a workout with cellular enabled, I had to make sure to bring my phone. I wonder what it would have been like after calibration
 

azentropy

macrumors 68040
Jul 19, 2002
3,278
3,281
Surprise
Sure, why not. My S5 hits low power warning at about 7pm every day now. This is my 4th watch (s0,1,4,5) and right now unless Apple significantly improves battery life it will be my last. Such a disappointing product.
 

lordofthereef

macrumors G5
Nov 29, 2011
13,038
3,586
Boston, MA
I just sold my series 3, not because battery was bad, but because I was starting to see a good bit of lag, texts weren't really syncing as read properly (sometimes a text would show up that I had responded to hours, or rarely, days prior), and of course Apple is discontinuing support, so figured I should get as much as I could for it before the nail is officially in the coffin.

Anyway, I am wondering if battery woes are because the newer models genuinely had a worse battery life, or if it's just because I am not a power user. Really hoping that explorer edition rumor is true. And that it falls into a price point between aluminum and stainless.
 

t0rqx

macrumors 6502
Nov 27, 2021
307
592
I wonder how much lower it will be showing pushing people to upgrade their watches to Apple Watch 8. Apple knows the 4-6 watches are the sweet spot momentarily.
 

jimbobb24

macrumors 68020
Jun 6, 2005
2,102
3,302
My Series 4 is at 80% battery health. Doesn't affect any of my day-to-day: I still can workout in the morning, wear it all day at work, and still do more activities in the evening before it starts to get close to 15-20%. When it starts affecting my daily activities, I'll just pay to get the battery replaced. The feature set of the Series 4 meets all my needs.
Exact same situation for me.
 

msackey

macrumors 6502
Oct 8, 2020
313
283
I can’t believe we’re already reaching watchOS 9. Seems like yesterday when watchOS was first introduced in the April 2015 launch.

Indeed, it does seem like just yesterday when the Apple Watch was introduced! I have a Series 4 that is still running quite well. I don't know how it is that after all these years, my Watch is at 93% battery health; it's quite high!
 

theob05

macrumors newbie
Jun 21, 2022
18
22
I mean, it’s a decent metric for people that want to know the overall health of the battery. However, I doubt most users will probably not pay attention to this feature, as they only seem to care when their Apple Watch is down to sub ~10%, which isn’t also healthy for lithium-ion to reach that low consistently.

On a side note:

I can’t believe we’re already reaching watchOS 9. Seems like yesterday when watchOS was first introduced in the April 2015 launch.
The first AW is now only capable of showing only time. I think Apple is obliged to indicate in capital letters on the box that the time of those maintenance and the shelf life of the battery often does not exceed about 4 years.
 

ian87w

macrumors 603
Feb 22, 2020
6,416
9,129
Indonesia
Apple should just do push notifications saying "your current toy sucks now, go buy a new one. " 😆 And have it persistent like those OS updates.
 

SantaFeNM

macrumors regular
Oct 13, 2012
100
120
Santa Fe, NM
For a $79 battery replacement fee does the Apple Store change the battery or just give you a new AWS4?
I had the battery replaced in my AW S4 in March of 2021. I had a significant scratch on the screen when I sent it off. Apple sent back to me a new AW S4, of course with a new battery and pristine screen. A big win-win in my case and opinion.
 
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