Dylan Smith wrote:

Larry Dighera wrote:

Charge time for the Altair batteries is only a few minutes as I
recall.

To put 70kWh's worth into a battery pack in 10 minutes would require a
charger capable of putting out 420kW.

It implies that you would either have to physically swap the batteries, or
have some sort of energy storage device that could quickly dump its charge
into the battery. That storage device could then in turn by charged at a
more leisurely rate.

All of this adds to the expense of providing useable energy, and each
conversion step adds to the inefficiency of the whole cycle.

As you mention, the electricity grid does not have the capacity to handle
the amount of power needed to charge everybody's car without major
upgrading.