It’s important if you use cartridges frequently to have a quality battery for your oil. There’s a lot of styles to choose from like the Ooze Twist that has the 510 threaded connection that you need and allows you to choose your temperature by simply twisting a wheel at the bottom of the pen. Click it three times to turn it on and away you go. Or if you’re looking for something a little different there’s the Exxus Snap that is a thicker but shorter design and has a magnetic connection that allows you to just snap your cartridge into place and you’re ready to roll. Other brands with powerful and discrete devices that we love are Randy’s, Airis, Stratus, and everyone else that you find in our inventory.