Fuel cell keeps drones in flight for hours, not minutes

A British company says it may have a solution to one of the most frustrating issues of drone flying: short battery life.In tests, a DJI Matrice 100 drone fitted with a hydrogen fuel cell from Intelligent Energy was able to stay in flight for more than an hour -- significantly longer than the 20 minutes available with its standard battery.Hydrogen fuel cells convert hydrogen gas into electricity through a chemical process that has water vapor as its only by-product. The fresh fuel comes in c