This one is supposedly due out next month (August) and it actually makes a lot more sense (and cents) than does Li batts, which have a limited life and are still risky.
http://trak.in/tags/business/2008/07/01/tata-motors-air-car-minicat/ How much more cents? Hmmm.... close to 1,600,000 give or take a few. and cheaper "refills" to boot.... Probably very sluggish, one suspects.... Zero to sixty by midmorning, if you start at dawn.... TaTa, as the Brits say. Jones