We know those hand warmers, those small portable radiators usually powered by petroleum-based derivative fuel. Sanyo got this idea: why don’t we turn them into electrical device? Why not, after all, we’re living in a battery world. But the company combines renewable energy and battery-powered devices.
The result? A solar-rechargeable battery hand warmer (see the update). The principle is easy to understand; a solar panel recharges batteries, you plug them into the hand warmer and voila. If keeping your hands warm is pointless to you, just buy the solar charger, it comes with rechargeable AA batteries that can be used in other devices, like a portable audio player or a toy.
Update — In a comment, a Sanyo spokesman asked us to make it clearer. The hand warmer isn’t powered by renewable energies. It runs on the Eneloop batteries, that could be recharged by the traditional way or by a solar-panel recharger. As we thought it would be nicer to rely on sunbeams to charge those batteries, we shrank the demonstration to its conclusion, the hand warmer is a solar rechargeable.