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You can't really 'store' energy if you are referring to electrical energy. The closest you'd get is a capacitor. Although a battery may seem like it stores energy it doesn't really it relies on a chemical reaction to produce electricity.

A spring can store mechanical energy and be made to slowly release that energy - that's how wrist watches and the like work.

There are otherways to store energy as well such as damning a lake and releasing the water in the lake via a damn. In Wales they do this. They pump the water up a mountain at night when electricity is cheap and release it during the day when it's expensive. Odd effect of market economics because it's highly inificient.

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14y ago

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