Reference Terms
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Fuel cell

A fuel cell is an electrochemical device similar to a battery, but differing from the latter in that it is designed for continuous replenishment of the reactants consumed; i.e. it produces electricity from an external fuel supply of hydrogen and oxygen as opposed to the limited internal energy storage capacity of a battery.

Note:   The above text is excerpted from the Wikipedia article "Fuel cell", which has been released under the GNU Free Documentation License.
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