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An elec­tric bat­tery is a device con­sist­ing of one or more cells that con­vert stored chem­i­cal en­ergy into elec­tri­cal en­ergy. Each cell con­tains a pos­i­tive ter­mi­nal, or cath­ode, and a neg­a­tive ter­mi­nal, or an­ode. Elec­trolytes al­low ions to move be­tween the elec­trodes and ter­mi­nals, which al­lows cur­rent to flow out of the bat­tery to per­form work.

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