"NantEnergy said that at $100 per kilowatt-hour, the cost of zinc air batteries compared favorably with that of lithium-ion batteries, which can be $250 per kilowatt-hour but are more typically $300 to $400"
However,
"At the present rate of production of zinc, zinc reserves will last about 25 years. So it is not clear from the reserves available if we will have enough zinc to support the enormous need that will result from the demand for grid-scale batteries."
https://www.nytimes.com/2018/09/26/business/energy-environment/zinc-battery-explain.html
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