Small three-element fuel-cell space battery produces more than two watts

Recently demonstrated for the U.S. Air Force was a three-element fuel-cell battery capable of operation in a space environment. The small prototype unit produces slightly more than two watts from three fuel cells weighing only if, ounce and occupying % cubic inch of space. At this power output, the battery delivers 150 watts per pound and operates at electrolyte current of 780 amperes per square foot of cell area.