For 4 days, power was turned off. If they were generating 90mW power out with zero power in, that’s almost infinite COP. At the very least it points to power storage capabilities that other batteries can’t match.
19.5 dBm is enough power to blow the front end out of a lot of RF detectors....................
Palladium is a rather expensive metal, being in the platinum group. Current Primary use is in catalytic converters for automobiles.
https://en.wikipedia.org/wiki/Palladium
Of course if we are all driving electric cars then it won’t be necessary.