Concealed 510 battery is specifically designed for discretion, allowing you to enjoy your vaping experience without drawing attention. Here are some of the best options available:

1. Cartisan Key BD Neo: This device looks just like a car key fob and features a flip-out cartridge holder for added discretion. It has a 650mAh battery with variable voltage and is compatible with all 510-thread cartridges .

2. Cartisan Veil Bar: A sleek and discreet concealed 510 battery that completely conceals your cartridge. It offers four voltage settings for customization and supports both button-activated and draw-activated firing .

3. CCELL Rizo: Designed to resemble an old-school mobile phone, the Rizo is incredibly easy to use with its draw-activated firing mechanism. It's also compatible with a variety of cartridges .

4. Caligo Opus 510 Vaporizer: This stylish and discreet device offers variable voltage settings and a preheat function for optimal vaporization. It has a 500mAh battery capacity for extended use .

5. Penjamin Cart Pen: This innovative device combines a concealed 510 battery with an actual pen, allowing you to vape without drawing attention as it looks like a regular writing pen. It's made with durable materials and offers a reliable vaping experience .

6. Everyday Canna Co Field Pen: A rugged and reliable concealed concealed 510 battery made with aircraft-grade aluminum. It offers variable voltage settings and an ergonomic design for comfortable use .

7. Hamilton Devices Butterfly: This sleek and stylish option features a flip-top design for quick cartridge loading and concealment. It has adjustable voltage settings and a long-lasting battery for extended vaping sessions .

When choosing a concealed 510 battery, consider factors like battery capacity, voltage settings, charging method, compatibility with cartridges, size and portability, durability, and ease of use .