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[–] motoguy 1 point 0 points (+1|-1) ago 

Its the same thing as a battery, except the difference is that when a battery stores its charge, the electrons introduced cause a chemical reaction to happen that changes the mixture inside the battery, while a capacitor (in very general terms), is more like a charge collector like you would get by walking with slippers on a carpet in the winter. The electrons just get bunched up on one side without modifying any of the chemistry.