Variable Voltage Twist Battery compatible with all 510 thread concentrate and essential oil cartridges. 

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The Cookies 900mAh 510 Battery is a slim compact battery that still packs a punch.  Featuring a 2 click preheat mode (15 seconds of continuous heating without holding the button) and adjustable temperature settings allowing you to adjust your voltage settings from a 3.3V - 4.8V.   the Slim Pen Twist Battery is perfect for anyone just starting to use cartridges or your everyday veteran. Compatible with all oil, concentrate, and essential oil cartridges with a 510 thread.

FEATURES Cookies Batteries 510 Thread Compatible 900 mAh Voltage: 3.3V - 4.8V 2 Click Pre-Heat Mode On / Off Function / Click 5 Time Fast Include USB Charger Overcharge Protection   YOU GET 1 Cookies 510 Thread 900mAh VV Battery 1 Cookies Charger