Slashdot It! They're batteries made by a kind of powdered carbon capacitor. They produce the same amount of energy per kg as a normal battery, but they're made entirely out of some kind of dialectically active carbon. The amazing thing is that the carbon particles do not connect to create a current until they are moistened. Of course, this means that they would be extremely sensitive to humidity. But if kept dry, they would keep their full charge indefinitely, unlike any other kind of battery. Also, because they're made of carbon, which is everywhere, and not processed metal, which is hard to find, they are much cheaper (about 10% the cost of normal batteries), take less energy to produce, and entirely non-toxic. Water-powered, they aren't. Environmentally friendly, they are.