The BlueZero E-Cell is an all-electric vehicle that stores energy in lithium-ion batteries. Its electric motor provides plenty of torque, but range is limited to approximately 62 miles on a two-hour charge, limiting this vehicle's usefulness to that of a city commuter.
For more range, step up to the BlueZero E-Cell Plus, an E-REV (Extended Range Electric Vehicle) similar in concept to GM's 2011 Chevy Volt. The same batteries and lithium-ion battery as the E-Cell are employed for primary motivation, but a three-cylinder turbocharged gasoline engine comes online to re-charge the battery pack when it becomes depleted, lending this concept a range of about 372 miles.
The third concept is called the F-Cell. It is a hydrogen fuel-cell car that uses a chemical reaction that results in the production of electricity from hydrogen (just like the Chevrolet Equinox fuel cell vehicle, or any other number of hydrogen fuel cell vehicles). Mercedes claims power output of 136 hp and approximately 236 pound-feet of torque, healthy numbers for the small concept that WorldCarFans sees as a preview for the next-gen B-Class, due in 2010.--Colin Mathews