A quality vape pen will typically have 510-threading that does not easily get stripped or cross-threaded. It will also have a long battery-life greater than 200 mAh, a battery-life indicator so you know when it's time to re-charge, and multiple temperature or voltage settings. Some vape pens may have a power button interface or auto-draw feature that is activated simply by inhaling. Other features to look for in a good vape pen are modern USB-C fast charging, pass through charging (you can use the vape while it's charging) or has other charging options such as a charging dock.