210 Ah cells to 90% in 12 minutes.

Assuming I can math early on a Monday morning:

90% of 210 is 189

189 / 12 is 15.75

So they charge at 15.75 an Ah per minute. Not sure how that compares honestly.

They're brand new and the writer needs a number to look impressive.

And last decades

Source: https://batteryuniversity.com/article/bu-502-discharging-at-high-and-low-temperatures

I don't have any data on sodium-ion.

If I'm not mistaken sodium ion is better with temperature and durability. The biggest problem is energy density, so they can't compete in any applications where size and weight matter. This leads to their 2nd biggest problem, which is that there's so much production infrastructure for lithium that no one wants to invest in new assemblies for other battery chemistries

They're meant to have a much wider temperature range than Li-ion, theoretically.

If I'm not mistaken, those portable power stations with AC inverters consume power even when not in use. You probably should use the DC output wherever possible.

What size? That sounds like a little 2000mah power bank.

They're meant to survive an order of magnitude more cycles than Li-ion. But I'm containing my enthusiasm until we see them lasting a long time in real life use.

I have read encouraging numbers about charge cycles for sodium batteries, I'm quite curious too about real values.