Garmin Vivofit is rerouting the incredible short battery life of wearable gadgets by launching an always-on fitness tracker that lasts more than a year on a single charge. We were able to wear the Vivofit fitness band without wearing down the battery at CES 2014 and quickly discovered that its secret is eschewing a backlight on its curved LCD screen and using some low-power efficiency tricks. That's pretty amazing given the fact that leading fitness trackers, like the Fitbit Force and Nike FuelBand SE , require recharging every seven days if you're lucky. They also require pushing a tiny button in order to read the time, daily step count, distance and calories. Vivofit displays all of this information without the need to press anything at all. Its single button is just used to cycle through the data. Even better, the Garmin Vivofit specs indicate that the battery is actually two user-replaceable CR1632 coin cells. Going down to the drugstore to buy these new batteries once a...
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