Good morning,
I recently heard about ZipCharge, it is a horrible idea as it stands, it's an 8kWh battery that you charge up at home/in the office then plug into your car to charge it up.
https://www.zipcharge.global/
It is sort of targeted at replacing today's use, say 20-40 miles, by people who have an electric car, do few miles and do not have access to street charging points or off road parking.
Although;
Electricity into the national grid->charge battery->discharge battery into another battery to charge that one is not exactly the most eco-friendly route.
If the functionality became a factory option, a small battery pack that is removeable and portable then it could help EV adoption in many cases. However it may be that what is portable to a 21 year old body builder may not be so portable for other potential users, thinking 10 flights of stairs as the lift is broken.
Bye
Ian