Bill Dub gets giddy when he talks about batteries and speed. After all, his 500-horsepower Killacycle electric motorcycle goes from 0 to 60 miles per hour in under a second. He claims it is the fastest electric vehicle on the planet. In October, the Killacycle traveled a quarter mile in 7.89 seconds, topping out at 174 mph, a record. Dub, 56, an engineer and Rhode Island native whose day job is designing air chemistry instruments at the University of Colorado, is the bike's designer, owner, and builder. He is out to prove that electric vehicles do not have to be nerd-mobiles." At the heart of electric vehicles like the Killacycle are the batteries. A123 Systems Inc., based in Watertown, sponsors the Killacycle and provides its battery. Dub read about A123's lithium-ion battery technology in 2003 and decided to approach company officials. He thought drag racing was a great way to torture-test the company's innovative battery cells. "I told them I'll take the battery cells out to the drag strip and set a world record," he said. Electric-vehicle racing hit the start line about 15 years ago, when pioneers like Dub began building the machines. "Bill is quite amazing and does pretty good promoting electric-vehicle racing in general," said Mike Willmon, president of the National Electric Drag Racing Association, based in Santa Rosa, Calif. The mission of the group, whose membership stands at 100, is to increase public awareness about the performance side of electric vehicles.