18650 Battery Adapter Tube for 20700 / 21700 Battery Mod

18650 Battery Adapter Tube for 20700 / 21700 Battery Mod $1.99
The 18650 Battery Adapter Tube is suitable for 18650 battery, which made it possible to use 18650 in 20700 / 21700 battery mods. This item also has other colors to choose.