The Ooze 650 Vape Battery is small and discreet but packs a significant punch. Ideal for both public and private use, this Ooze 650 battery will please newbies and veterans alike. Compatible with all 510 thread cartridges, it's powerful enough to easily vape the thickest oil cartridges with 3.7V voltage. In addition, featuring a 20-second preheat mode, an auto-shut-off function, and an overcharge protection chip. This pack of 5 batteries is an incredible value and a great addition to your current vape and smoking products!