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.
Yes, but as they say in the article, the ideal is to combine them with eg lithium so you get the power as well!
If indeed they can manage good recycling and refilling it sound to me very promising!