The GRAV Micro-Pen Battery is small and discreet. It's available in multiple matte colors that complement any cartridge and its three temperature settings make it quite versatile for a small battery. If small and unassuming is what you're looking for in a vape battery the GRAV pen makes a good choice. The Micro-Pen is the perfect accessory for vaping on the go. Small vape cartridge battery 130mAh battery Three settings: 2.6V, 3.0V, and 3.8V. Length: 3in 510 threaded Button control or inhale to hit