This concept Soft Solar Battery is all kinds of clever. It charges up via the sun of course, but once rolled up fits neatly into a conventional AA type battery compartment to power up your gizmo. A fabulous idea, which really deserves to reach production. [Via]
Using renewable energy from the sun, Solar Soft Battery provides an environmentally friendly means of collecting solar energy and actively converting it into stored electrical energy. Designed as a soft strip, the battery is able to collect a maximum of solar/light energy with its large surface area. When rolled up, it takes on the shape of a battery and is able to be used for all kinds of battery-operated products.