Single battery mods are just as they sound, devices that house a single battery. 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. This page shows our range of single replaceable battery mods, compatible with18350 batteries, 18650 batteries and 21700 batteries, from beginner to pro models. Some are capable of using multiple types of battery with an adapter, but it's always worth checking the product page to see which batteries your mod is compatible with.