A lengthy interview of Ian Clifford of Zenn  Motors who indicates that EEStor will publicly prove its breakthrough  ultracapacitors soon. (H/T Talk Polywell
The  ZENNCity electric car which would be the first vehicle to use these batteries  has a 52kwh 250 mile range EESU that would only weigh 280  pounds.
EEStor is building a state of the art pilot  production plant that is very significant. The Zenn Motors CEO and others have  seen the EEStor plant.
EEStor is to deliver a production prototype off of  the production line by the end of 2009. Once they deliver a production prototype  it is a production unit that is production ready.
EEStor stores their  energy at around 3500V. Zenn Motors would step that down to operating voltages  likely in the 600 V range. Very very high efficiency drive system operating at  much higher voltages than any other current EV drive system. That does a number  of things. It increases the drive efficiency, it makes the components somewhat  smaller, and ultimately less expensive and obviously for mass commercialization  that's a very important consideration.
Jul 29, 2009
Breakthrough Ultracapacitor Technology for 250 mile range
Read full at nextbigfuture