https://hydrogen-central.com/hyliumx-liquid-hydrogen-fuel-cell-drone-can-fly-5-hours-straight/

Hyliumx liquid hydrogen fuel cell drone can fly for 5-hours straight.

What sets the HyliumX liquid hydrogen fuel cell drone apart from the others is its flight time, as the company reports that it can fly for over 5-hours straight without needing to be powered up. For comparison, the DJI Mini 2 SE is good for up to 30-minutes on a full charge. No specifications have been revealed, but we do know that it measures 749mm x 792.5mm x 597.5mm.

Its Liquid Hydrogen Power Pack combines an ultralight liquefied hydrogen fuel tank with a Proton exchange membrane fuel cell, thus resulting in high efficiency energy perfect for military, infrastructure, agriculture, delivery and many other applications. The HyliumX can be deployed from a Mobile Ground Control Station (mGCS), which has a built-in hydrogen refueling system onboard.