This is the scaled up equivalent of an external laptop AC/DC power brick. It’s faster because it’s supplying much, much more power. Multiple homes worth. Batte

This is the scaled up equivalent of an external laptop AC/DC power brick. It’s faster because it’s supplying much, much more power. Multiple homes worth. Batteries need DC to charge and putting the transformer in the external fast charger means the one in the car itself only needs to be sized for lower power domestic charging.