How to sell a car in the future.
#1 Rip out fuel burning engine
#2 Install AC motor
#3 Install EEstor, Or Li-ion batteries that use different Anodes or Cathodes to reduce cost and risk..
#4 Install support equipment..
#5 Make an Ad
#6 Profit...
For battery tech read this interesting blog post
http://www.dailykos.com/story/2008/5/19/184014/140