Smartwatches are a tricky business. Stick too much battery in them, and they become uncomfortable and bulky. But if you go too small, it won’t hold a charge long enough, and it becomes a frustrating thing to own. Garmin’s answer to the problem seems so obvious you might wonder why it wasn’t the first solution—solar power.
Source: Garmin Will Power Some of Its Smart Watches With the Blazing Sun – Review Geek