Rechargeable and completely recyclable, the Water-Powered battery runs off ordinary tap water, or ANY water-based liquid.
Free of heavy metals and electrolytes, they are dormant until water is added.
Several different types of water-powered batteries have now been developed, including the NoPoPo, which is a carbon-magnesium battery, a type using using copper-magnesium cells, and a type using aluminum anodes which uses seawater rather than tap water. Also being developed is the HydroPak, a portable power generator that uses water-activated disposable fuel cartridges. This power source produces much higher power levels and have longer life spans than the other models discussed.
Here is a description of the development of one type of water-powered batters, featuring Japanese inventor Susume Suzuki: