Yes, but. As I recall the story, when a fuel-cell consumer powerbrick startup, with a working production prototype, and the broader impact of expanding the envelope of consumer-scale parts supply in several areas (eg air pumps), went looking for $10M to start their supply chain, and avoid dying, ARPA responded "we can do $1M, but our budget is tight just now, and we can't do 10." What people say they want, and what they're willing to pay for, are often poorly correlated.

> Better batteries would change everything [...] Cost-to-orbit

Yes. Also small durable high-torque electric motors.