for capacity: https://insideevs.com/news/738124/toyota-portable-hydrogen-cartridge-fcev/#:~:text=Gallery%3A Toyota Portable Hydrogen Cartridges&text=Toyota didn’t say how,of 161 grams of hydrogen.

161grams = 5kwh+ of heat energy or close to 3kwh of electric only energy in a fuel cell.

For drones, ebikes, powerstations, this would be higher electric weight density than batteries. And solves ebike/powerstation charging on the go problem.