why is that glv 18650 version so tall? 4.5 inch for just a battery tube + button seems to quite long. Lets say GP paps (bottom button) is about inch shorter with 18650 battery. Atmizoo roller (regular side button) is 3.9 inch with 18650 battery and side button
mods are usually bigger than bottom.
Sizewise there shouldnt be difference if its bottom or top switch.
The way i see it is that mods should be as small as possible, extra space sould be cut down or exloited for VV or bigger battery.