i don't know about battery life, i haven't had it long enough.
I had an MC-E dropin also that ran around 30 mins regulated on high, so I expect this SST90 to be even worse.
this is a single mode, direct drive, it starts getting hot the instant it is turned on. The pictures are with basically new batteries, but the output starts dropping off from peak after using it a couple times just because how quickly it eats batteries. So the output/discharge is probably like an incan.
i wonder if a TIR/optic can be made for this LED, that would be even more insane.