DETROIT-The all-electric car, which had a brief heyday less than a decade ago before the car companies killed it, is about to make a comeback. Charged up with lighter, more efficient batteries and competitively priced with gasoline-driven vehicles, the new offers will be marketed and sold primarily as second cars. Nissan , Ford, Mitsubishi, Chrysler and Subaru, among others, are planning to introduce electric vehicles over the next year. MORE