Major energy storage product classification:<br>Electrical energy conversion to potential energy: water storage energy (large site, high cost), compressed air energy storage (low efficiency), flywheel energy storage (immature).<br>Electrical energy conversion to magnetic energy: superconducting energy storage (immature).<br>Electrical energy conversion to heat energy: hot water storage, thermal phase change material energy storage (low efficiency).<br>Electrical energy conversion to fuel: electrolytic water to make hydrogen (technically immature, inefficient).<br>Electrical energy conversion to electrochemical energy: battery energy storage (large safety hazards, poor low temperature performance, short service life).
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