Does lithium make mild hybrids worthy?

Lithium powered full hybrid concept, Toyota's FT-HS

Everyone knows the future of hybrid cars and electric cars seems absolutely dependent upon cost-effective, reliable and safe lithium-ion batteries. Without such batteries, forget the Chevy Volt, forget a 100 mpg Prius, forget plug-in hybrid vehicles.

Obviously, however, if li-on batteries are successful, the entire automotive world will be turned upside down and change forever. Finish: does lithium make mild hybrids worthy?