I bought the Twins to use on my current V1 ProVari. I know, "why?" when the extension cap works fine. Well, I had already decided that at some point I was going to buy a mini, mostly because the teardrop pattern appeals to me. The new 2.5 "Ribbed for your pleasure" doesn't really strike my fancy, though I may get one at some point.
The extension cap for the ProVari has a rounded bottom and I tend to knock stuff over often. With the extension tube and regular battery cap, the ProVari is much more stable. I'd estimate that when I get it, the Mini will stay in 18350 mode 90% of the time. But when I'm camping, I'm going to want and need that 18650 option.
Batteries : AW Protected 18650 3400 mAh
anyone know how long a 3,400 mAh battery would last? I already get over a day with my 2,500 mAh batteries.