You can see similar information here as toobadorz tried a LISHEN LR2170SA which is the same as the yellow Liitokala lii-40A. This is a 15A continous rated battery. It’s voltage does not sag under the load and the light runs at 4,000 lumen for 1 minute when the thermal protection starts to ramp it down.
The only 30A continous rated 21700 I have seen is the Samsung 30T. I don’t think anyone has tried this combo yet.