V

510 battery  Variable Voltage 650 Mah V-Battery The V LO is pretty straightforward, but if you need a battery for your 510 cartridges, look no further. This battery features everything you need (aside from a cartridge, of course), and nothing that you don't The LO features both variable-voltage as well as a pre-heat option to make this little battery the perfect option for practically all 510 oil cartridges.  Cycling through the different options couldn't be any easier. Clicking the button 5  times powers the battery ON/OFF. clicks For Variable Voltage and finally 2Times For Pre-heating.