[rcxdude]

Swapping does help reduce the high peak power demands that fast charging has. There's limited places where you can get the infrastructure to install a bank of chargers capable of this kind of speed (though, one potential approach is having a local block of batteries near the charger, but you are then paying the efficiency cost of another battery round-trip, and the cost of the batteries which will get a lot of wear and tear themselves)

[crote]

The charging station's batteries don't have to use the same chemistry though, as they aren't space- and weight-constrained like EV batteries are. You can optimize for durability and cost instead.

Having station-based storage also allows the station to participate on the energy market and purchase only when electricity is cheap. It could even do double duty by selling back electricity from storage during periods of high grid demand! Heck, pair it with a local grid storage battery which is going to be built anyways and you basically get it for free.

[wakawaka28]

Station batteries are an additional toxic inextinguishable fire hazard and expense to consider. I wonder what is the efficiency loss in charging one battery to turn around and charge another too. But you are generally right: stationary batteries do not need to be lightweight like the ones in cars.

[NetMageSCW]

But if you need batteries that gives you the opportunity to install solar and reduce your costs more than the efficiency hit.