There is a Canadian company, 3d printing mounts, that attach to the brow (top vents) of dye i4's and other masks. It's pretty slick, I'll look up the...
They're not on the website yet - they're $34.99 and the coil is about 42" long (plus the size of the fittings). It's QD only - you can easily remove...
Duracell Procells maintain their peak output much longer than typical 9V's, so you might want to consider running those if you didn't want to go the...