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Before anyone cries about the environmental cost of lithium, concrete batteries are a thing and are far more ideal for grid storage.

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You mean gravity batteries using concrete weights? A scam for suckers.

Nope: https://news.mit.edu/2025/concrete-battery-now-packs-ten-tim...

So, about two orders of magnitude lower specific energy than Li-ion batteries. The extra cost per kg had better be damned small or this won't pencil out.

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