Protonex Technology Corp. has received a $599,000 contract with the U.S. Naval Research Laboratory to develop fuel cell power systems for aerial drones. The Southborough, Mass., fuel cell developer will create high-power generating units to power small unmanned aerial vehicles using the company’s proton-exchange membrane technology. The goal is to create a hydrogen fuel cell that can produce about 1.5 kilovolts of power output in a much smaller generating unit. The award comes in addition to the $500,000 Naval contract Protonex received in June for UAV fuel cell development and is the fourth military contract the Company has received this year.