Lookah Snail

The Lookah Snail is a compact, variable voltage cartridge battery.  There are no magnets to worry about here.  You simply screw the cartridge directly into the device.  You can swap between the 3 preset voltage levels by clicking the button 3 times quickly.  The preset levels are perfectly spaced at 3.2V, 3.6V, and 4.2V.  The built-in 350mAh battery charges with the included Micro-USB charging cable.