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Fuel cells are different from most batteries in requiring a continuous supply of fuel and oxygen (normally from air) to sustain the chemical reaction, whereas in a battery the chemical power usually comes from substances which can be already present in the battery. Most good water energy sites (those not requiring large trendy dams) in Europe had been developed throughout the medieval period. In this sort of fuel cell, the membrane have to be hydrated, requiring water to be evaporated at precisely the identical rate that it’s produced.