This page shows our range of kits using a single 18650 battery (sold separately). By having 2 sets of batteries and an external charger you no longer need to wait for your device to charge, you can just swap batteries and go. Batteries also degrade over time and use, and so having a device that has easily replaceable batteries can keep your vape going for longer. Single 18650 devices are perfect for those looking to upgrade from a smaller starter kit. These kits are perfect for those looking to have a replaceable battery device, while still keeping it as compact as possible.