Dave Plowman wrote:

Andy Burns wrote:

But for fast DC charging, AIUI the external charger is connected (maybe
via a contactor?) to the car's battery

You're hardly going to use jump leads, so assume the connector on the car
for fast charging (and the charger that fits it) takes all this into
account?

Yes, it's not 12VDC, between the car and the external charger, they
negotiate over a data connection to supply up to 1000V and up to 500A,
though for the full whack it needs silver plated contacts and liquid
cooled cable, harry's granny cable can't compete.