ah so these don't have the ability to discharge as much energy...

ah so these don't have the ability to discharge as much energy as Li-ion batteries, but for the volume and half the weigh have the same total energy

I wonder why then this would be more applicable to a drone or aerospace application - perhaps something that is not particularly heavy hence the reference to drones and high altitude flights, but won't these still need a decent amount of energy to launch?

Without cars it would seem to reduce the TAM, but yes there may be other applications where weigh is a significant issue (boats perhaps)