Beastmaster
Enlightened
Does it look something like this?
Heh. It's even more severe with a non-protected 123a rechargeable, but a very similar pattern to the lithium AA primary you have.
I was playing with the L1 this morning at work. I got about 15 minutes on high, then a severe step down, then another 8-9 minutes of light, stepping down quick.
I suspect it goes from regulated to direct drive.
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