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

Apple's upcoming watchOS 9 software update will recalibrate the maximum battery capacity of the Apple Watch Series 4 and the Apple Watch Series 5.

The company disclosed the feature in the release notes for watchOS 9 beta 2.

After updating to watchOS 9, your Apple Watch Series 4 or Series 5 will recalibrate and then estimate its maximum battery capacity more accurately. (93206868)


With the second beta of watchOS 9, we observed a 3% increase in maximum capacity. The battery also went from requiring service to being 'normal'.

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