Stylus Battery Vape Pen
The original Vape Pen, or "open vape" style pen. This compact battery works with any 510 cartridge (this battery does not come with any cartridge or oil included).
It also has a stylus tip on the end, so it can be used as a stylus for your phone or tablet in between puffs. No need to push any kind of button, just pull on the tip and the battery is activated and vaping begins.
Simple, easy, and cheap.