Re: What is "smart"
The eco-drive used to use a capacitor rather than a battery to store excess power since changed to a manganese lithium battery, the panasonic MT950 (with or with specific connecters). The MT950 is 1.5 v with a 5mAh nominal voltage/ capacity (since the change to lithium it will eventually need replacement). Where a basic fitness band has a 60mAh battery lasting anywhere between 5-20 days depending on features. So to get the same kind of duration from a solar system would need 12 times the area of the watch face.
However there is a Citizen W770 with bluetooth and eco-drive that will vibrate or point a hand on a dial if a phone has received a notification. Apparently that will last 9 months on a full charge (no idea about the battery model) but you've got to wonder why a small lcd or e-ink screen was not used to display some additional information, like the type of notification is as you still have dig the phone out of the pocket.
Biting the hand that feeds IT
