It's extremely low density. Not suitable for a car.

Similarly there was a battery swap battery that was an Aluminum metal battery. Amazing range. But required specialized facilities to recharge. So you would have to battery swap which is complicated and expensive.

The problem is that for most people, just plugging into their garage power outlet is the cheapest and most convenient system. (I'm not one of those people since I have no garage. But you design around the norm, not the exception.)