EEStor announced a patent grant last week. Lots of folks have commented on it but it has the potential to be a significant change. An ultracapacitor that can hold the equivalent Kwh (52) as the Tesla battery pack weighing only 286lbs versus 992lbs for the Tesla. The other two dramatic changes are that the ultracapacitor looks to have a nearly unlimited duty life and more importantly can charge in less than 10 minutes.

Cost is still going to be an interesting question but it should scale down over scale and time, plus unlimited duty life may mean you can move it car to car. The interesting thing is that its relatively easy to build out the home side of the charging kit that uses an ultracapacitor sitting in the garage to quickly charge the car while the stationary one can recharge more slowly on a high voltage line. That system can also be scaled into the gas station infrastructure as well.

Now they only have to make it through the 1000's of other hurdles that can doom a new technology to failure.