The second beta of watchOS 9 was released to developers on Wednesday, and Apple’s release notes for the new beta shows it adds a new maximum battery capacity recalibration feature for the Apple Watch Series 4 and Apple Watch Series 5.
The recalibration allows an Apple Watch to provide more accurate estimates of battery life. Following the update to watchOS 9, your Apple Watch Series 4 or Series 5 will recalibrate and then estimate its maximum battery capacity more accurately.
The recalibration process will happen during the update and will be complete once it’s installed.
Apple Watch Series 4 and Series 5 owners who have noticed that their wearable’s battery life is being misrepresented should be able to get a better indication as to how long their device will last.
Apple has offered recalibration for its iPhone lineup since the iPhone 11. However, Apple Watch users have until now lacked a similar feature.