What’s a more renewable form of energy than human energy? We’ve seen it before with the human-powered gyms in Hong Kong, and here’s a portable energy source that’s powered by the spring in your step. We just discovered this amazingly useful gadget at CES, and can’t wait to get our hands on one. The Weza Portable Energy Source from Freeplay can produce enough power from a few footpumps to jump-start a boat or automobile battery and power a laptop, light or a variety of other electronics. If you were stuck out in the middle of nowhere, you could even use to charge your cellphone!

Weza is a Swahili word that means “power,” and how fitting of a title. The small device provides power to products via a 12 V DC cigarette lighter adapter, saving your butt in emergency situations and bringing renewable power to all your gadgets. Weza has an LED display bar to show battery and input effort levels, and the battery is a safe non-spill, 7 amp-hour lead-acid gel battery. Depending on the effort applied, this creates electrical energy of 25 to 40 Watts. It even comes with a 2 year warranty. Here’s a great individual solution to creating usable energy, off-the-grid, and using your own blood, sweat, and tears. Well, maybe just sweat.

+ WEZA – $299 from Freeplay