Good point. It can't have much battery. Also wonder if the propellant/s are cryogenic. Monopropellant? You could tell from analyzing the plume.

I think everyone is getting too caught up in the Thrust and Rocket variants. There aren’t going to be very many of those. But the base model will just be a regular Tesla.

Sounds like it was just compressed air (rechargeable on the fly). Impressive if true.