@solrize They're not sense resistors; they're just resistors. There are no active electronics in this light. Changing a resistor should change the output.
Looks like a typo caused excluded the graphs, which I've now fixed. I think they answer the other question: output depends on battery voltage in both modes.
@solrize Current measurements are in the runtime table. Like I said, I think the output (and therefore efficiency) measurements may be a little optimistic. It does have a boost converter.
I agree a powerbank function would be a great addition here. It would be the perfect larger travel light if it had that. The tailcap magnet is easy to remove.