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Zinc-air is mature technology with high energy density, you can get electricity directly without any fire risk and zinc is abundant enough. If we despite all that are unable to get it used beyond hearing aids, then what are chances for iron?

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What are the main blockers?

I am no expert, only assume it's the logistics you need to collect/ship zinc oxide out and fresh zinc in.

This is true of all existing metal-air batteries BTW. You need to open them up and physically replace the metal.

You can use them twice with Fluorine.

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