We really endorse working with an exterior battery charger for 18650 battery mods, as it helps with balanced charging and prolongs the lifetime of the battery and mod, for instance from worn out microUSB port. We hugely endorse using an external battery charger for 18650 battery mods, as it helps https://johnathansydh07406.bloggazzo.com/26610013/master-your-vaping-experience-with-geek-vape-coils-mods-and-more