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No clue if any of this is reliable, but...
https://www.inceptivemind.com/form-energy-100-hour-iron-air-battery-10-times-cheaper-than-lithium/20248/?fbclid=IwAR1Elp61k0OcUFZ1_JpcX2LGwetA_zAGJv_eXfwlMxOl7QQlZ697bzPRlCw
