Finger Fuel Cell

Plastic cylinder with reloadable metal pipe electrode, separator, carbon felt and graphite rod core, metal pipe touches the bottom metal plate and graphite rod is the top contact, with some carbon felt to let the fuel cell exchange air, and add the electrolyte. Designed to be used upright but can be possibly used in any orientation, because electrolyte liquid does not escape from the separator and carbon felt, but is infused in the salt bridge. Majority of the fuel cell weight is the metal pipe, from 80% up, other materials are plastic and carbon felt/graphite, which are many times lighter than the metal in same volume, especially iron. Specific energy rating is 80-95% close to the metal energy density, from1.3kWh/kg of zinc to 9.0kWh/kg of silicon.