For some people, having a hybrid car doesn’t quite do the job. One company, A123 Systems of Watertown, MA, has been selling battery systems to convert hybrids to plug-in electric, increasing a Prius economy from 50 mpg to 100 mpg.…
For some people, having a hybrid car doesn’t quite do the job. One company, A123 Systems of Watertown, MA, has been selling battery systems to convert hybrids to plug-in electric, increasing a Prius economy from 50 mpg to 100 mpg.…