I think they might be still working on it as I didn't see anyone offering test drives.

But, if some of the research being conducted today pans out, this hunk of lucite could represent the future of electric cars.

IBM is one of a number of companies touting lithium-air batteries as an alternative to standard lithium-ion batteries. Lithium-air batteries contain lithium ions, but instead of having the lithium ions shuttle back and forth between a cathode and an anode, lithium-air and zinc-air batteries generate power by exposing metal and an electrolyte to oxygen. This oxidizes the metal and releases energy (see Electricity From Air and Zinc? A Growing Chorus Says Yes). This model is being shown at the Almaden Institute taking place at IBM's Almaden lab this week.

In the end it could potentially lead to energy density that's 10 times better than current energy densities. Energy density, which effectively measures a battery's capacity to store electrons, remains a major problem for lithium-ion batteries in cars. (IBM's material science division has created membranes for lithium-air batteries. Big Blue wants to license and/or sell that: It likely won't become a battery maker.)

The note on the concept car says it could go 500 miles on a charge and provide 120 kilowatt hours of energy capacity. Nissan's Leaf will have an energy capacity of 24 kilowatt hours.