Next year, DaimlerChrysler plans to introduce its second test hydrogen car, B Class, to test drivers, according to Nick Cappa, manager of Advanced Technology Communication at the company, reports. The car will be bigger than the current A Class and go about 250 miles before running out of fuel. The fuel cell stack, the part that converts hydrogen and oxygen into electrons and water, will also ideally last about 5,000 hours – about the same amount as a conventional gas engine. According to, currently the fuel cell stack destined for the B Class lasts about 2,500 hours. It will also convert about 50 to 60 percent of the fuel into actual work. The fuel cell in the A Class is about 38 to 45 percent efficient while gasoline cars rank only 14 percent.