It's weird, you're getting far better battery life than I am. I strapped on my watch at around 9am, and the watch was dead by 7pm. That's bad.
I was barely playing with it today, too. I received around 6 emails, and only about 10 other notifications total. I read a few of the emails directly on the watch, and archived them (with the mixed results I mentioned above - very annoying). I may have done one or two voice searches as well. This amount of use should by no means suck so much battery that I can't get all the way through the evening. I'm pretty disappointed.
Is it possible to turn off all fitness aspects of the watch? I don't want to use them, especially since I firmly believe that wrist-based fitness trackers cannot match the traditional Fitbit (attached to your torso). It's my hope that disabling those features will extend my battery life...
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Matt