510 USB Charger:
This is a USB charger for most slim 510 batteries (i.e Boge Expert 510). This is a cable-free design but must be plugged into an appropriate usb power source (i.e. Mini wall charger, PC usb port).
For Best Results: Be sure to clean both battery threads & charger threads before each connection to remove eliquid build up and to increase product life expectancy.