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a zinc-air battery could be re-stuffed with electrolite, thus "recharging" the cell. also, zinc-air batteries have insane energy density 200 wh/kg+, but not so awesome power density (high internal resistance) and aren't rechargable, only replacable, or refillable (fuel cell style)
so yes, they are nice, but the refilling.. I have to see about that.
opinions?