These solar-powered smartwatches have seriously long battery lives
These Garmin and G-Shock timepieces will track your workouts and get a boost from the sun, too. (Garmin / G-Shock / Stan Horaczek /)Battery life is a crucial metric for smartwatches. The ubiquitous Apple Watch boasts about 18 hours of energy between charges, although the company is likely announcing new models tomorrow. But, it’s not just the size of the battery that determines its life—power from the sun can help extend it, too.There are plenty of options out there for those who want a watch with fitness features such as step and workout monitoring, but don’t necessarily need a touchscreen device that can pull off tricks like making a phone call.I’ve been testing out a pair of $399 solar-boosted smartwatches for some of the summer, and each of them have batteries that last weeks, not hours. Here’s how they stack up.Garmin Solar InstinctThe Kansas-based company debuted new solar-powered watches this...