21700 battery case holder with key chain hole

by TechnoWit3D

this battery case holder for 21700 and Nitecore with usb charge NL2150R (Heigh 77.2 mm, diameter 21.7 mm) internal space dimension : - Height : 80 mm - Diameter : 22 mm total Outside dimension : - Height : 112 mm - Diameter : 30 mm Use O ring with diameter to make it more air tight