[roastbeef]

if that is what you got from the article, you are ignorant.
its actually a great idea. there is already battery management tech that monitors the user's typical activity for certain days/times to manage battery health. you can also turn it on and off. imagine buying a tesla style "wall" battery pack for your home... why buy one when you already have the equivalent in your electric car? the car could potentially power your house if the power goes out.
also, if you utilize "time of use" utility plans (cheaper to use electricity during certain hours), you could save on costs by supplementing your home electricity consumption by using your car, then simply recharging your car in the cheaper tier of time/cost structure.

i actually thought of something similar by purchasing a tesla wall battery. however, it isn't cost effective because they won't sell just one, the minimum order is for two. my wife and i are low consumption- no kids, efficient appliances. the house is about 2,300 sq/ft (air conditioning), and i charge my electric car that i daily drive. with my time of use plan, i get charged 13 cents per kilowatt hour, but between the hours of 4pm-9pm, i get charged 38 cents per kilowatt hour. i avoid charging my car during these hours, and my thermostat automatically raises to 75* unless i have guests over. if i could buy a reasonably priced battery have have it programmed to supply power to the house from 4-9pm, that would be ideal. if i could achieve this with a car that is already going to be in my driveway, it saves money.