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A fuel cell is an electrochemical cell  that converts the chemical energy  of a fuel (often hydrogen and an oxidizing agent  (often oxygen  into electricity through a pair of redox  reactions. Fuel cells are different from most batteries  in requiring a continuous source of fuel and oxygen (usually from air) to sustain the chemical reaction, whereas in a battery the chemical energy usually comes from metals and their ions or oxides  that are commonly already present in the battery, except in flow batteries. Fuel cells can produce electricity continuously for as long as fuel and oxygen are supplied.