Re: Ultracapacitors? Babelfish gave me this: http://tinyurl.com/yun7uf Babelfish has improved a lot, most of the article is actually comprehensible. Most interesting part to me. . . They are projecting 2/3 the volumetric energy density of li-ion. So hypothetically you could drop these into a Tesla Roadster and get about 150 miles range, lighter weight, fast recharge, and indefinite service life. Not bad. However, it should be apparent that they don't even have a demonstrable prototype yet, and they are quite a few years from finding their way into products of any kind.