Jim Cramer said on Mad Money that Ener1 (HEV) is one of his first favorite speculations.  He said “”That’s one of my favorite speculations. I think that you want to be in that. It’s a lithium battery company. I also like Sociedad Quimica (SQM) as an even better play.”

Developing smaller lithium batteries than can hold increasingly longer charges while remaining safe will be a big barrier to wide spread adoption of electric plug in cars.  It will be interesting to watch these companies.