You'd have to run an IMR, no? In both the cases of PA10 and PC10, it says compatible with Li ion battery for max performance. But the drain must be so high, I think you're still looking at IMR territory, not LiCo
What I"m confused about is the PC10 and PC20. Why make the 1x16340 550 lumens, but the 2x16340 410 lumens? 2x should handle the drain better. And why does the PA10, on 14500, get another 100 lumens still at 650 lumens? These guys definitely have me confused! Still, I like the interface, if I could make sense of what they're up to...