Solio, $129.95. solio.com ★★★★ This 150g solar-cell-powered charger could be just the thing if you go for long hikes, enjoy camping or just want to be ready for storm season. You can charge it through the USB outlet on your computer, connect it to a power point through a wall plug, or use the power of the sun. It takes about four and a half hours to charge via your computer and about twice that to charge it by solar energy. The Bolt has two solar panels that pivot on a point. That point can be propped up with a pencil to face the sun. You can use it to charge any device you can charge through a USB, such as a smartphone, a tablet, a camera or an iPod.