Apple Watch Series 4 and 5 Will Recalibrate Maximum Battery Capacity With watchOS 9

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

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.

Related Roundups: watchOS 10, watchOS 11
Related Forum: Apple Watch

Popular Stories

Apple Vision Pro 2 Feature 2

Apple Reportedly Suspends Work on Vision Pro 2

Tuesday June 18, 2024 8:17 am PDT by
Apple has suspended work on the second-generation Vision Pro headset to singularly focus on a cheaper model, The Information reports. Apple was widely believed to have plans to divide its Vision product line into two models, with one "Pro" model and one lower-cost standard model. The company is said to have been deprioritizing the next Vision Pro headset over the past year, gradually...
apple watch series 9 display

Kuo: Apple Watch Series 10 to Get Larger Screen and Thinner Design

Monday June 17, 2024 1:20 am PDT by
This year's Apple Watch Series 10 will be thinner and come in larger screen sizes than previous models, according to Apple analyst Ming-Chi Kuo. In his latest industry note -10-and-98075c44ce92">shared on Medium, Kuo said the screen size options on the next-generation Apple Watch will increase from 41mm to 45mm, and from 45mm to 49mm, while being encased in a thinner design. For reference,...
2022 back to school apple feature

Apple's 2024 Back to School Sale Launching This Week

Monday June 17, 2024 12:27 pm PDT by
Apple will launch its annual Back to School promotion for university students in the United States and Canada this week, according to Bloomberg's Mark Gurman. Apple's back to school sales provide students with a free Apple gift card when purchasing a Mac or an iPad, and this year's promotion could help Apple push the new M2 iPad Air and M4 iPad Pro models. Last year, Apple offered U.S....
Apple Pay Later feature 1

Apple Discontinuing Apple Pay Later

Monday June 17, 2024 11:44 am PDT by
Apple is discontinuing Apple Pay Later, the buy now, pay later feature that it just launched last October. Apple Pay Later is being discontinued as of today, but people who have existing Apple Pay Later loans will be able to continue to pay them off and manage them through the Wallet app. Apple announced plans to end the feature in a statement provided to 9to5Mac, which also notes that...
iOS 18 CarPlay Feature

iOS 18 Adds These 5 New Features to CarPlay

Thursday June 13, 2024 7:44 am PDT by
Apple did not mention CarPlay during its WWDC keynote this week, but iOS 18 includes a handful of new features for the in-car software. Overall, there is not a whole lot new for CarPlay on iOS 18, with changes seemingly limited to the Messages and Settings apps so far. Below, we recap everything new for CarPlay on iOS 18. New for CarPlay on iOS 18 1. Contact Photos in Messages App...
iPod Nano vs iPod Pro Ad Feature 1

Apple Developing Thinner MacBook Pro, Apple Watch, and iPhone

Monday June 17, 2024 2:22 am PDT by
Apple intends to slim down the MacBook Pro, Apple Watch, and iPhone, with the new ultra-thin M4 iPad Pro a sign of the company's new design trajectory, according to Bloomberg's Mark Gurman. When the M4 iPad Pro was unveiled last month, Apple touted it as the company's thinnest product ever, and even compared it to the 2012 iPod nano to emphasize its slim dimensions. Writing in the latest ...
watchOS 11 Thumb 2 1

watchOS 11 Supports Automatic Nap Detection

Monday June 17, 2024 4:05 pm PDT by
watchOS 11 appears to include a new feature that allows an Apple Watch to automatically detect and record when you're taking a nap. As shared on Reddit, an Apple Watch owner took a nap and was able to see the sleep data recorded in the Health app, despite not putting the device in Sleep Mode. Right now, the Apple Watch only tracks and records sleep when it is in Sleep Mode, and there is no...

Top Rated Comments

applefanboysince93 Avatar
26 months ago
instead of a %batteryLife estimate there’ll be a $BuyANewWatch message ;)
Score: 16 Votes (Like | Disagree)
Blackstick Avatar
26 months ago
End of the day... the issue is those cells are pushing 4 years old in the case of a well used/loved Series 4. Software optimization can only go so far when you're talking about a 4 year old battery with 1400 cycles on it.
Score: 9 Votes (Like | Disagree)
wwooden Avatar
26 months ago
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.
Score: 3 Votes (Like | Disagree)
SantaFeNM Avatar
26 months ago

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.
Score: 3 Votes (Like | Disagree)
Shirasaki Avatar
26 months ago
My series 4 still hold strong after all these years (4 years). 88% battery health. Good enough feature set to last incredibly long. Wonder how this “calibration” would work.
Score: 3 Votes (Like | Disagree)
HappyDude20 Avatar
26 months ago
For a $79 battery replacement fee does the Apple Store change the battery or just give you a new AWS4?


Not applicable to my S5 since I will not be downloading iOS 16 until next Summer, at the earliest.
Why holding out?
Score: 2 Votes (Like | Disagree)