The Wulf Pro Bat is a slim, pen-style cart battery from Wulf with a built-in OLED screen.

• 400mAh battery with voltage adjustable from 2.0V to 4.2V
• OLED screen shows battery level and voltage
• 12-second preheat function
• Auto shutoff after 12 minutes of inactivity
• Universal 510 thread connection

The onscreen readout makes this vape pen battery easy to keep tabs on.