The average technophile can find herself carrying an array of gadgets on the average day out: smartphone, tablet, digital camera, and so forth. Even with advances in battery technology, it's not uncommon to find one's power indicator creeping into the red during a day of normal use, or to see those vibrant, high-resolution screens we love so well go blank late into a day of heavy use. Plugging in may be no problem if you're near a power outlet, but what if you're off in the woods? What if you're looking to lower your carbon footprint but still want to keep in touch on Facebook or snap pictures
