does anyone know if RFX has actually done tests using external...

does anyone know if RFX has actually done tests using external tanks of 5 times capacity? Any issue or downside as there would be applications where smaller longer endurance current is all that is required an if the $ are in the stack and control electronics you end up with a 5x larger capacity battery at cost of liquid and storage of liquid?

I know the theory is Ok but then what about cycling battery is it the stack or the liquid that determins that? Yes being lazy rather than pull out old files.

Initial surge and higher short term outputs may in future be helped along with super capacitors as well.