Transformative approach uses the human body to recharge smartwatches (edit.umass.edu)

> The prototype currently doesn’t produce enough power to continuously operate a sophisticated device such as an Apple Watch but could support ultra-low-power fitness trackers like Fitbit Flex and Xiaomi Mi-Bands

Glad to see that we're finally catching up to 1773. https://en.wikipedia.org/wiki/Automatic_watch