Search and rescue is a valued application for drones, but mountain rescues at high altitude have been difficult due to the technology barriers created by the use of lithium batteries. Commercial drone manufacturer MMC addresses that issue with the hydrogen-powered HyDrone 1550. MMC's trained pilots traveled from to Yunnan Province, China to test the HyDrone 1550 in some of … [Read more...] about Hydrogen Drone, HyDrone 1550, Successfully Tested at High Altitudes