How does a fuel cell work?

A fuel cell is a means of producing electricity. It can be used as a sort of rechargeable battery and is useful where there is no possibility of obtaining power from the mains electrical grid. The difference between a fuel cell and a rechargeable battery is that the battery is charged with electrical current, while the fuel cell is instead charged with hydrogen. Hydrogen is thus the fuel cell’s fuel, which as a result of a chemical reaction is transformed into electricity and water.