Brass Knuckles battery is designed to utilize concentrate oil cartridges and comes in the three variations of wood, silver, or gold finish. Brass Knuckles battery features 900mAh capacity with variable voltage and preheat mode. It works like a regular vape pen battery with single button operation settings: 5-clicks will turn on or off the battery, 2-clicks will activate the Preheat mode for 10 seconds and 3-clicks will switch the voltage.
Features of BK Battery :
- 5 Clicks to turn on and off
- Adjustable voltage from 3.2v-3.7v-4.1v
- 650mah/900mah large capacity
- Patented USB Charger
- Compatible with ALL 510 thread Cartridges.