Duracell 700 Flashlight 18650 Mod

thingiverse

I became fed up with constantly buying batteries, so I created this device. Standing upright, I printed it using a 6 mm brim to maintain stability; its height is 145 mm. A 4x1/4 inch flat head stove bolt was used, which had the slot ground down and cut to an overall length of 82mm. There's a countersink on the inside to accommodate the bolt's head. This unit works seamlessly with both flat top and button top 18650 batteries.