Yes. That is exactly what a battery is, stored energy.
Energy can also stored in chemical bonds. Plants take sunlight and make sugar molecules. Then animals eat the sugar break the bonds and use the energy released from the chemical bond break.
Yes — most commonly in household batteries. There are six types of rechargeable batteries: Lead Acid, Lithium Ion, Lithium Ion Polymer, Nickel Cadmium, Nickel Metal Hydride, and Reusable Alkaline. Electrical energy can also be stored directly in the electrical power grid, in hydroelectric dams, giant batteries, compressed air mines, or hydrogen, for instance.
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