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A comment on First claimed successful replication of LK-99 superconductivity (includes video). Parent comment
https://en.wikipedia.org/wiki/Lithium-ion_battery
1–10 Wh/kg for superconductors, 100–265 Wh/kg for batteries.
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https://en.wikipedia.org/wiki/Lithium-ion_battery
1–10 Wh/kg for superconductors, 100–265 Wh/kg for batteries.