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.
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.
Popular Stories
After releasing watchOS 27.0.1 for the Apple Watch Series 12 and Apple Watch Ultra 4 last week to address a bug that was causing devices to restart unexpectedly, Apple has now released the update for all eligible watches, which includes Series 9 and later.
Apple's release notes say only that the update "provides bug fixes for your Apple Watch" and the company does not list any security fixes,...
Wednesday September 23, 2026 12:44 pm PDT by
Juli CloverApple today released watchOS 27.0.1, a minor update to the watchOS 27 operating system that came out last week. The update is limited to the Apple Watch Series 12 and Apple Watch Ultra 4.
watchOS 27.0.1 can be downloaded through the Settings app on the watch or the Apple Watch app on a connected iPhone. Software can only be installed when the Apple Watch is on the charger and has over 50...
Apple has apparently listened to user feedback and brought back the App Switcher screen in the latest watchOS 27.2 beta, but accessing it is a little different than before.
In watchOS 26 and earlier versions, a double press of the Digital Crown would bring up the App Switcher, where you could easily switch to the last-used app and view and open other recently used apps. You could also swipe...
