Good revive on this thread.
My Fitbit Charge 2 is on its way out. Battery life fairly diminished and the glass is scratched to the point you can barely read it in direct sunlight.
I'm aiming at one of the Garmin watches, but man, $$$$. I don't need something that can do music, just my normal activity tracking (with cycling options), and long battery life. I just happened to stumble across a solar version they make I might have to look into.
Biggest disappointment is the battery life when GPS is active. They're good for maybe 5-8 hours, tops. GPS off might get 5-7 days. Fortunately I don't need to use GPS all the time since I have a little Garmin Edge 130 for the bicycle to do all my tracking.
Instinct Solar is a smartwatch built to conquer the elements featuring a solar charging lens, GPS/GLONASS/GALILEO, and built-in training apps.
buy.garmin.com
Smartwatch: Up to 24 days/54 days with solar*
Battery Saver Watch Mode: Up to 56 days/Unlimited with solar*
GPS: Up to 30 hours/38 hours with solar**
Max Battery GPS Mode: Up to 70 hours/145 hours with solar**
Expedition GPS Activity: Up to 28 days/68 days with solar*
*Solar charging, assuming all-day wear with 3 hours per day outside in 50,000 lux conditions
**Solar charging, assuming use in 50,000 lux conditions