Searching for a dependable cartridge battery packed with modern features? The Brass Knuckles 900mAh Adjustable Battery now includes a sleek digital screen, blending contemporary convenience with its classic style. This upgraded version offers variable voltage control, a handy preheat mode, and a universal 510 connection, making it ideal for all concentrate oil cartridges.

Stay fully informed during use with the digital display that clearly shows your current voltage setting and remaining battery life, giving you ultimate control and confidence every time you vape.

Retaining the simple single-button operation you love:

• 5 clicks to power on/off
• 2 clicks to activate the 10-second preheat mode
• 3 clicks to cycle through voltage settings

The LED color system intuitively changes to match your voltage choice: Green for 2.4V, Blue for 3.2V, and Red for 4.0V.

With a robust 900mAh battery capacity, enjoy extended vaping sessions. Easily recharge using the included USB charger. Compatible with all 510-thread cartridges for maximum versatility.

Reliable, stylish, and now enhanced with a digital screen for effortless monitoring.

Brass Knuckles 900mAh Adjustable Battery with Digital Screen Features and Specifications:

• 3 Voltage settings (Green: 2.4V, Blue: 3.2V, Red: 4.0V) – simply click 3 times to switch modes
• Preheat mode – activate with 2 clicks
• 5 clicks to turn the device on/off
• Battery Capacity: 900mAh
• Universal 510 Connection
• Safety protections: short circuit, overcharge, and overtime safeguards