If the thought of your phone running out of power and not having anywhere to plug it in is enough to keep you up at night (or you simply spend a lot of time off the grid), then a solar-powered phone charger could be just the thing you need. Where once solar chargers were more a novelty than a practical solution, these days many are powerful enough to get your phone back to full power in just a few hours. They’re a great option for hikers and campers to keep their phones juiced up, as well as a handy device to keep in your car in case of an emergency.