For the future, button or flat top?

[FlashKat]

This review [REVIEW] Thorfire TK15 & TK15S (XP-L2, 1x18650) (Pictures, Output, Beamshots, etc.) mentions using EVVA protected Panasonic NCR18650B.

@rickw12

The description of the Thorfire tk15 on Banggood doesn’t say whether the battery can be protected or not. If protected batteries can sometimes be longer than others, how would a user know whether they will fit? Do manufacturers usually say if they won’t fit? Or do you usually have to read reviews to find that out?