It's a very Poor Design if the Lavatube can't run of Any 18650 made. Doesn't it have a spring on the end cap to account for different battery sizes?
Kinda like Every flashlight I have Every owned does.
I agree they should have made them a little longer with a longer spring but I think they wanted them to only fit IMR batteries. I'm using 18650 AW IMR 1600 and AW IMR 2000's and they fit perfectly in mine.
My Indulgence has a longer tube and spring so all 18650 batteries work in it.


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