If you use an 18650 battery, you need to select the 18650 value that is displayed on the mod. If you install a 20700 or a 21700 battery, you need to select 21700 on the display.
If you use an 18650 battery, you need to select the 18650 value that is displayed on the mod. If you install a 20700 or a 21700 battery, you need to select 21700 on the display.