Another Zinc-Air battery company. Have a three year trial project in NY at a claimed $45/MWH. Company is targeting long duration discharge to gain this price point >8 hours. Could be a good daily renewable energy "extension" product - pushing solar or wind into longer generation periods.
This technology appears to be similar to flow batteries with a chemical storage tank that is enlarged to extend durations. In addition there are lower cost materials in the construction. They do not mention the round trip efficiency so that could be an issue.