Ok, although I suppose that in your example of the D80 a tail current of 4.65A is going to shorten the lifespan of the emitter significantly as its specified maximum current is only 3A?
In the case of the 219B, if the graph below is somewhat similar to that of the 219B, it would seem that more current from a more capable battery does not result in more lumens (unless this is due to insufficient heat dissipation as the graph mentions alumimum which may not be ideal):
(from Cree, Luminus, Seoul Semiconductor, and Nichia LED comparison)
so even if it will tolerate the higher current provided by, say, a Samsung 30Q in direct drive, that might not be the best choice as it will have reduced runtime with no increased output? Although I suppose the capacity of a non-high-drain current battery might also not be achieved if you drain it close or at it’s max current?