The linked article is interesting not so much because of the fuel cell technology, but the quiet statement at the end of the article telling us the markets they will be targeting. Although they make what appears to be an under statement, having worked there I can say with certainty it's what they intend to do.
Ballard Launches Next Generation Fuel Cell System for Drones, Expands Insitu Flight Testing - sUAS News - The Business of Drones
Ballard Launches Next Generation Fuel Cell System for Drones, Expands Insitu Flight Testing - sUAS News - The Business of Drones