Penjamin Cart Pen Review 2025: The Ultimate Stealth 510 Battery That Actually Writes
Penjamin Cart Pen Review 2025: The Ultimate Stealth 510 Battery That Actually Writes
Updated: November 2025 | 9 min read
In the world of discreet vaping, the Penjamin Cart Pen by Smyle Labs has created quite a buzz—and for good reason. After researching dozens of reviews and user experiences, we're here to give you the complete lowdown on this ingenious device that doubles as a real writing pen. Is it just a clever gimmick, or does it actually deliver as a quality 510 battery? Let's find out.
Quick Verdict: Should You Buy the Penjamin?
Rating: 4.2/5 Stars
The Penjamin Cart Pen is more than just a novelty—it's a legitimate discreet 510 battery that happens to be one of the stealthiest options on the market. While it has some minor drawbacks, its unique dual functionality and solid performance make it an excellent choice for anyone prioritizing discretion without sacrificing vapor quality.
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What Exactly Is the Penjamin?
The Concept That Started a Trend
The Penjamin (clever wordplay on "pen" + "Benjamin") is a fully functional ballpoint pen that conceals a high-performance 510 thread battery. This isn't just a vape that looks like a pen—it's an actual writing instrument that you can use to jot down notes, making it the ultimate in plain-sight discretion.
Key Features at a Glance
- Dual Functionality: Real ink pen + 510 battery
- Universal Compatibility: Works with 0.5g and 1g cartridges
- Variable Voltage: Three temperature settings
- Preheat Mode: Double-click activation
- Stealth Design: Looks exactly like a regular pen
- Rechargeable: Micro-USB charging (the one downside)
Real-World Performance Review
Vapor Quality: Surprisingly Impressive
Despite its compact size, the Penjamin delivers solid vapor production. Users consistently report:
- Strong, satisfying hits comparable to larger batteries
- Smooth draw with good airflow
- Consistent performance across all voltage settings
- No burnt taste when using preheat function properly
Battery Life: A Full Week for Most Users
The Penjamin's battery capacity is optimized for discretion rather than power, but it still manages to impress:
- 7-10 days of moderate use per charge
- Multiple daily sessions possible
- Quick charging (under 1 hour for full charge)
- LED indicators for battery status
Temperature Control Options
Three voltage settings provide flexibility:
- Low (2.7V): Best for flavor, lighter hits
- Medium (3.2V): Balanced performance
- High (3.7V): Maximum vapor production
The Genius of the Design
Ultimate Stealth Factor
What sets the Penjamin apart is its authentic pen appearance:
- Writes with real ink (twist bottom to extend tip)
- Pen clip for pocket/notebook attachment
- Professional appearance suitable for any setting
- Rubber cap conceals cartridge completely
- No suspicious bulges or shapes
How It Works
- To Write: Twist the bottom counterclockwise to extend the pen tip
- To Vape: Remove the rubber cap, insert your 510 cartridge
- Power On: Click button 5 times
- Preheat: Click 2 times (optional)
- Adjust Voltage: Click 3 times to cycle through settings
Who Is the Penjamin Perfect For?
Ideal Users:
- Office workers who need maximum discretion
- Students who want to blend in on campus
- Travelers looking for TSA-friendly options
- Anyone in prohibition states needing stealth
- Minimalists who appreciate dual-purpose items
- First-time users wanting something simple
Maybe Not For:
- Heavy users needing all-day battery life
- Cloud chasers wanting maximum vapor
- Tech enthusiasts wanting USB-C and digital displays
- Users with larger/wider cartridges (may not fit)
Pros and Cons: The Honest Truth
What Users Love ✅
- Unmatched discretion - literally a functioning pen
- Quality construction - feels premium, not cheap
- Easy to use - simple button controls
- Reliable performance - consistent hits
- Affordable price - around $34.99
- 60-day money-back guarantee from manufacturer
- Viral popularity - proven track record
Common Complaints ❌
- Micro-USB charging - outdated in 2025
- Limited battery capacity - not for all-day sessions
- Small chamber - less vapor than larger batteries
- Cartridge size limitations - some don't fit under cap
- Occasional charging issues - some units arrive dead
- Limited color options - mostly black/basic colors
Comparing to Other Discreet Options
Penjamin vs. Other Stealth Batteries
| Feature | Penjamin | Car Key Fob | Pulsar DL | Regular 510 |
|---|---|---|---|---|
| Discretion | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐ |
| Battery Life | ⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Vapor Quality | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Price Value | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐⭐⭐ |
| Unique Factor | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐ | ⭐ |
Tips for Getting the Most from Your Penjamin
Best Practices:
- Always preheat thick oils - prevents clogs
- Start on low voltage - preserve flavor
- Keep pen upright when not in use
- Clean threads regularly - maintains connection
- Don't overtighten cartridge - can damage threads
- Use the adapter for 0.5g cartridges
- Keep spare ink refills - maintain the disguise
Troubleshooting Common Issues:
- Not charging? Try different cable/adapter
- No vapor? Check cartridge connection
- Weak hits? Clean contact points with isopropyl
- Pen won't write? Twist bottom further
The Verdict: Innovation Meets Functionality
The Penjamin Cart Pen isn't just another 510 battery—it's a genuine innovation in discreet vaping. While it won't replace a high-capacity home battery, it excels at what it's designed for: providing reliable, stealthy sessions when discretion is paramount.
For under $35, you're getting:
- A conversation starter
- A functional writing pen
- A reliable 510 battery
- Peace of mind in public
- The ultimate stealth vaping solution
Where to Buy the Penjamin
While the Penjamin is available from various retailers, we recommend purchasing from trusted sources to ensure authenticity and warranty coverage.
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Why Buy from Discreet Smoker?
- ✅ Authorized retailer with genuine products
- ✅ Fast, discreet shipping in plain packaging
- ✅ Customer support for any questions
- ✅ Competitive pricing with occasional promotions
- ✅ Easy returns within 14 days if unopened
Final Thoughts
The Penjamin Cart Pen has earned its viral status not through marketing hype, but through genuine innovation and solid performance. It's the perfect solution for anyone who needs to keep their sessions on the down-low without sacrificing quality.
Is it perfect? No. The micro-USB charging feels dated, and heavy users might find the battery life limiting. But for what it's designed to do—provide ultimate discretion with reliable performance—it's nearly unbeatable.
If you've been searching for a truly discreet 510 battery that doesn't scream "vape device," the Penjamin is your answer. It's not just a pen that vapes or a vape that looks like a pen—it's both, and that makes all the difference.
Ready to Experience Ultimate Discretion?
Don't wait for this viral sensation to sell out again. The Penjamin Cart Pen is the stealth solution you've been looking for.
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Free shipping on orders over $50 | Discreet packaging guaranteed
Frequently Asked Questions
Q: Does it really write? A: Yes! It's a fully functional ballpoint pen with replaceable ink cartridges.
Q: What size cartridges fit? A: Standard 510 thread cartridges, both 0.5g and 1g sizes. Includes an adapter for smaller carts.
Q: How long does shipping take? A: Typically 2-5 business days within the US when ordering from Discreet Smoker.
Q: Is it TSA-friendly? A: While it looks like a regular pen, always check current TSA regulations regarding vape devices.
Q: Can I replace the ink? A: Yes, replacement ink cartridges are available from Smyle Labs.
Q: Why micro-USB in 2025? A: This is the main criticism. Hopefully, future versions will upgrade to USB-C.
This review is based on extensive research of user experiences and expert opinions as of November 2025. Individual results may vary. Always use products responsibly and in accordance with local laws.
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