You know any vaporization device has its own longevity, the battery does. You'll devote plenty of TLC to your vaporizer tank and the e-cig cartridge but don't forget the battery itself. Batteries should be fully charged before you begin to use it. Batteries should also be cleaned and changed about once per day if you're a frequent vaper/smoker. To clean it, remove the tank cartomizer to look for accumulated build-up and use a cotton swab to clean the contact. Only use a dry or alcohol dampened cotton swab to clean your tanks and battery contacts. Be careful not to overfill your tank with e-liquid. This may cause the atomizer to get saturated and make a mess on your table. Do like this to lengthen your Eleaf iStick battery's longevity.