Do those have an inverter built in? If not, at $600/kWh very pricy compared to what this guy used at $190/kWh for batteries, or $360/kWh including the inverter:
If is he talking power bank, then big ones, usually called power stations, have inverters. But they can’t be used as UPS since they cut power when switching sources.
https://www.amazon.com/dp/B08G81TKC6?ie=UTF8&th=1&linkCode=s...
Also, $190/kWh is so cheap. Its hard to believe how fast costs are falling for energy storage.