Rock down to “Electric Avenue” at the 2010 North American International Auto Show in Detroit this week, and you might think that sales of battery-powered cars were going to take the industry higher sooner rather than later. Twenty models from automakers large and small get their own 37,000 square-foot section at the annual show, and a few of the featured cars, like the Chevy Volt and the BMW B-Class F-Cell, actually hit dealer showrooms this year.
