USB-C or iPhone dual charge variable voltage vape battery. Fits all 510 cartridges and packs 650mAh battery capacity – perfect for around-the-clock use, even if you’re vaping on thicker oils! Pocket VV cart vape for oils & e-juice 12mm diameter (fits 2g carts) Variable voltage (2.4v, 2.8v, 3.2v) Preheat setting for thicker oils 650mAh battery capacity for all-day use Upgraded 510 VV battery, now with Dual charging capabilities(USB-C and iPhone) and a 12mm diameter so it sits flush with all your 2.0ml tanks. The standard 510 connection means that this battery is compatible with most 510 cartridges and tanks. Its 2-click preheat feature lets you toggle between different voltages (2.4v, 2.8v, 3.2v), so you can adjust the power output depending on the viscosity and the thickness of the oil you’re using. Easy to operate (one-button), and standard USB charging both mean this will quickly turn into your favorite vape accessory.