Brass Knuckles 510 Thread Battery w/ Charger

Functions of the battery:

- 2 click preheat mode.
- More Power 20 seconds hold time.
- Adjustable voltage : 3.3 v - 4.1v
- Press twice to preheat for the extra thick oil 
- Volume: 900 mAh
- Compatible with any 510 thread cartridge
- Preheating output: 1.8v
- Display of 30 vape batteries