HT204641: Update the software on your Apple Watch
Learn about Update the software on your Apple Watch
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All replies
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Helpful answers
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Oct 28, 2015 10:34 AM in response to SticksDaveby Jonathan UK,Hi Dave
Apple has not advised of any differences in expected battery life between watchOS 1.x and watchOS 2.x.
Also, performance and stability updates within watchOS 2.0.1 include: "Fixes issues that were impacting battery performance".
Update the iOS software on your iPhone, iPad, or iPod touch - Apple Support