The PIEPii 510 Thread VV Cartridge Preheat Battery from DazzLeaf is one of the coolest mini pipe shaped batteries on the market and is compatible with most 510 cartridges. Powered by an internal 1000mAh rechargeable battery, the PIEPii VV Battery is equipped with four variable voltage settings, preheat mode, LED indicator lights, short circuit and overcharging protections.