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What do you mean by storing energy?

Reserve energy has the following two meanings:

1, which stores the unused energy in the living body.

2. Energy storage, that is, the generated energy is collected at one time for later use, so as to reduce the imbalance between energy demand and energy production. Devices that store energy are often called batteries or battery packs. Energy has many forms, including radiation, chemical potential, gravitational potential, electric potential, electricity, high temperature, latent heat and kinetic energy. Energy storage includes transforming energy from a form that is difficult to store into a more convenient or economical storage form. Some technologies can provide short-term energy storage, while others can last longer.