Dual switch hosts? 1 x 18650 or multiple 18650 side by side only.

Flashlight Modding and DIY Parts
4

Courui DO1 COURUI DO1 'Big Head' (Black/GRAY NOW AVAILABLE) $29.99 @ Gearbest ( use coupon: gbcourui) A long-throw modder's light!

You can easily add a rear clicky switch, just solder a switch instead of the small cable and drill a hole for the rubber cover in the back. See Courui Big Head overhaul with XP-G2

I would like to hear some details regarding driver and firmware.