The title should really be the quest for a cheap smartwatch with battery life, which seems to be what the author was looking for. The more expensive Garmin watches have excellent battery life and solar charging. I use a Garmin smartwatch. One of the surprising things about Garmin is that they don't have a proper app store. They have an app where you can load apps into your watch, but it's rather crippled by having no…
For me GPS is a must-have. I want the tracking of my walks/rides. Looking at the Garmin specs, the two-week battery life is sans-GPS. With GPS enabled the battery life is the same as the Apple Watch.
Apple said their GOAL was 18 hours (mixed usage). Good grief.