Nova 900 mAh battery $10 each. *Cosmic Edition*
Instructions:
2 click preheat mode.
More Power 20 seconds hold time.
Adjustable voltage : 3.3 v - 4.8v
Press twice to preheat for the extra thick oil 
Volume: 900 mAh
Length: 95mm
Diameter: 11.2mm
Weight: 22g
Voltage: 3.3 v - 4.8v
Compatible with any 510 thread cartridge
Preheating output: 1.8v