Triple XMLs in parallel present a different load to the cell, and don't run into the same Vf wall as a single cell with a single LED. I'd love to see a DD single LED test between one of these and other common cells.
Wish I could use cells as long as these, but I don't think 3 will fit in a 3D Mag (or will they?) without altering/replacing the stock switch housing to gain some extra space, even after reworking the tailcap.
edit: Just did some measuring and they would technically fit, but man, it would need a tailcap spring that'd be so short you couldn't really call it a spring.
edit2: Total length would be 1.125" longer than 3 D alkalines. Yikes.
my three xm-l2’s are in series with three cells in series feeding them (dry driver)
their in a trj 19 which has a good mass to it and their on Noctigon boards. I’ll be interested to do a tailcap reading but I actually plan to run this light on feilong 32650 cells.
Anyway, you could double bank them, for 800A and 42V. That would only be 80 of the batteries, though. This would never ever be done withou tons of electrical protection circuitry. Uh, I doubt it would ever be done anyway. They do use this battery in electric golf carts and some electric powered cars, but I don’t know the voltage and amperage they use.