The Cartisan Veil Bar is easily one of our favorite 510 cartridge batteries for many reasons. The first reason we love it so much is its massive battery! While this vape is small enough to conceal in your hand, hidden inside is a 650mAh battery which will easily get you through the day in between charges. Next, with 3 adjustable heat settings to choose from you can fine-tune your hit with ease to get the best results out of different carts. It also has a super large capacity, up to 2mL, to fit almost any cartridge you might get, and comes with all the accessories you need to make a smaller cartridge fit just as well. Finally, this unit is crazy durable and even protects your cartridge from breaking and provides insane discretion, completely hiding the cart, which is one of the biggest reasons so many people prefer the Cartisan Veil Bar compared to normal pen batteries.