The Kind Pen 510 Thread AutoDraw Battery makes it super simple to enjoy your concentrates. Vape pens that have an auto-draw battery are very easy to use. Simply start inhaling, no buttons, no nonsense. Cartridges screw right into the top of the 510 Thread AutoDraw Battery as well as its included USB charger. This 280mAh battery fits the commonly used 510 thread tanks making it compatible with popular brands.