Other researchers worked on a sligh

Other researchers worked on a slightly different power source. It is called a fuel cell. A fuel cell could be twice as strong as a lead-acid battery. But, even today, it is too heavy and costly. Researching was also studied. Drivers wouldn't mind stopping to often for a recharging if it took only minutes. Still another idea was to design a lighter car. Then a regular battery could push it faster and farther.