On one and the only charge. Metal-air batteries are one-shot devices. I, personally, wouldn't want to deal with a battery replacement - neither after 1,000 miles, nor after 2,000 miles. As the article says, people are reluctant to buy vehicles that require frequent and expensive service. There was another company in Israel, Better Place. It is dead now. However a bunch of people bought electric cars that depend on Better Place's battery swapping stations. Now they have to charge them themselves - and it is not trivial.
Still, this development may end up being useful for EVs. But, as I said on many occasions, EVs should first be used in high mileage, small range applications - local delivery, taxicabs, business. Only there the lower cost of each mile can be quickly converted to real savings. A car for a common man has to be universal, long range, and easy to refill - it is the hardest target, outside of heavy trucks. Common man does not drive all that much, and there are good chances that the car will be scrapped because of old age before it crosses the threshold of savings.
Furthermore, slow or delayed delivery of benefit makes the lump sum that is paid for the car even larger, as this money is tied up instead of being invested. As many people calculated, a Tesla for $60-80K may never become profitable; you could buy a $20K car, invest $40-60K on 5%/yr terms, and this would net you a fixed income of $2-3K per year. Today that will pay for 500-750 gallons of gasoline, or (at 40 mpg) for 20-30K miles per year, forever. You must drive more than that to have a hope of ever breaking even because an EV has its own costs per mile. A heavily used fleet car can easily exceed this mileage; however an office worker who drives 15K miles per year cannot do that.
They've gone on to a better place?................
I'm not sure it's supposed to, nor the gas engine cars in the same class. On the other hand Nissan has a lease going on for the Leaf for $199 a month. That is about $161 less than the wife spends on gas for her commute.