The battery claims from altair nanotechnology are very exciting, if true.

Why is it that, decade after decade, we are constantly tantalized with wonderful new technologies that are never heard from again? (we have a built in conspiracy generator; TPTB are constantly buying these wonder patents up and destroying them!!!!! DEATH TO TPTB!!!!        
       :-)

because the "technologies" are either fabrications or they can't be sold at a profit.

There seems to be a lot of companies out there working on new battery tech. I'm sure someone's product will be more than snake oil and end up having a combination of good power density and life expectancy to really drive electric cars as an option.