1. Discreet Design: A pen battery pipe is designed to be compact and discreet, often resembling a writing pen, making it easy to carry and use in various settings.

2. 510 Thread Compatibility: A pen battery pipe often uses the 510 thread connection, which is a universal standard for attaching cartridges or atomizers to the battery.

3. Variable Voltage: Some pen battery pipes offer variable voltage settings, allowing users to adjust the power output to customize the vaping experience.

4. Inhalation Methods: A pen battery pipe can be draw-activated (requiring the user to inhale to start the vaporization) or button-activated (where pressing a button starts the process).

5. Battery Life: The capacity of the battery in a pen battery pipe (measured in milliampere-hours, or mAh) determines how long the device can be used before needing to be recharged.

6. Rechargeable: The battery in a pen battery pipe is typically rechargeable via a USB cable, making it convenient for on-the-go use.

7. Safety Features: High-quality pen battery pipes come with safety features such as short-circuit protection, overcharge protection, and automatic shut-off to prevent battery exhaustion.

8. Material: A pen battery pipe can be made from various materials, including stainless steel, aluminum, and other metals, which may affect the weight and durability.

9. Portability: Due to its small size, a pen battery pipe is highly portable and suitable for those who want a convenient vaping option.

10. Ease of Use: A pen battery pipe is generally easy to use, with simple operation and minimal maintenance required.

11. Customization: Some pen battery pipes allow for the attachment of various types of atomizers or cartridges, offering a degree of customization.

12. Sub-Ohm Vaping: Certain pen battery pipes are capable of sub-ohm vaping, which involves using low-resistance coils to produce larger vapor clouds.

13. Temperature Control: Some advanced pen battery pipes offer temperature control settings, providing a more precise vaping experience.

14. Durability: The build quality of a pen battery pipe can affect its durability and longevity.

15. Price Range: Pen battery pipes are available at various price points, with more advanced models featuring additional capabilities and higher price tags.

16. Aesthetics: A pen battery pipe comes in different colors and styles, allowing users to choose based on personal preference.

17. Legal Considerations: Depending on the substance used, there may be legal restrictions on the use of a pen battery pipe, varying by region.

When using a pen battery pipe, it's important to follow the manufacturer's guidelines for use and maintenance to ensure safety and optimal performance.