When it's on my Watch gets a day of battery life, when I turn it off and only tap the screen, I'm getting 3 days of battery life. Now I'm not using the Watch any less, to me it just proves that the screen keeps turning on when it doesn't need to. I constantly notice it turning on when I have the feature on.... Apple really messed up on the design of that feature.
Getting it right on the Watch 2 will be the single biggest battery life performance improvement.
Getting it right on the Watch 2 will be the single biggest battery life performance improvement.