Mechanical batteries are a thing. In general, flywheels store kinetic energy in their rotation. They usually exist just to smooth the operation of a system, but flywheel energy storage can be useful where a chemical battery would fail, like in regenerative braking systems or when temperature changes greatly and frequently. FES can be "recharged" many more times, do not lose as much charge over time.>>11060884>are there systems...
Yes. See the example ITT about dams but the most common example would be water towers. We could theoretically pump water to your house ever time you need it, but in practice it is much easier to pump the water to a tower ahead of time, storing the potential energy, and releasing it the moment it is needed.>>11060871