The Smyle Labs Penjamin is a discreet 510-thread cart battery disguised as a permanent marker, built for vapers who need stealth without sacrificing function. It holds carts up to 4 grams and fits in a pocket, pencil case, or desk drawer without a second glance — perfect for people who vape in shared spaces or just prefer to keep things low-key.
Why the Penjamin works
- Actually invisible in plain sight — looks exactly like a permanent marker, so it blends into any desk, bag, or junk drawer without raising questions
- Handles larger carts — compatible with carts up to 4g, so you're not limited to standard half-gram options
- Standard 510 threading — works with the carts you already have, no proprietary nonsense
- Pocket-friendly form factor — the marker shape clips naturally and doesn't roll around like cylindrical batteries
- No learning curve — pull the cap, attach your cart, and go
Best for
This battery is made for vapers who share living spaces, work in offices, or just don't want their gear broadcasting what it is. If you've ever had to explain what a vape pen is to a nosy coworker or roommate, the Penjamin solves that problem by looking like something nobody asks about. It's also solid for travel — TSA doesn't look twice at markers.
How to use it
The Penjamin works like any other 510 battery, just with better camouflage. Remove the cap to reveal the threading, screw on your cartridge, and you're ready. The marker cap stores your cart when not in use, protecting the mouthpiece from pocket lint and keeping everything contained.
For best results, start with shorter draws to gauge how the battery heats your particular cart — different oil viscosities respond differently. The compact design means airflow is tighter than larger vape setups, which some people actually prefer for flavor density.
When your cart runs low, unscrew it and swap in a fresh one. The battery charges via USB (cable not included with most units, so check your drawer of random cables). Keep the threading clean with a dry cotton swab if you notice connection issues.
Specifications
| Feature | Detail |
|---|---|
| Brand | Smyle Labs |
| Model | Penjamin |
| Threading | 510 (universal) |
| Cart Capacity | Up to 4g carts |
| Design | Permanent marker disguise |
| Portability | Pocket/clip-friendly |
What's included
- 1x Smyle Labs Permanent Marker Penjamin Cart Battery
Compatibility notes
The Penjamin uses standard 510 threading, which covers the vast majority of pre-filled cartridges on the market. If your cart screws onto a typical vape pen battery, it'll work here. The 4g capacity rating means you can run larger carts without the awkward overhang you get with some compact batteries.
One thing to know: the marker design means the internal battery is smaller than chunkier mods. For all-day heavy use, you might need to charge more frequently. For casual sessions throughout the day, it holds up fine.
Frequently asked questions
Does this work with all 510 carts?
Yes. Standard 510 threading is universal across most cartridge brands. If your cart works on other vape pen batteries, it'll work on the Penjamin.
How big of a cart can it hold?
Carts up to 4 grams fit without issue. That covers everything from standard half-gram carts to the larger format options some brands offer.
Does it actually look like a real marker?
Pretty convincingly, yeah. The form factor, cap design, and overall shape match what you'd find in a desk organizer. Someone would have to pick it up and inspect it to notice the difference.
How do I charge it?
USB charging — check the base or side for the port. Most 510 batteries use micro-USB, though some newer models have moved to USB-C. A cable may or may not be included depending on the batch.
Is there a button or is it draw-activated?
Check the unit for a small button near the base — some Penjamin versions are button-activated, others are draw-activated. Both work fine, it's just preference. Button-activated gives you more control over when heating starts.
Can I store the cart inside when not using it?
Yes. The marker cap covers and protects your cart, keeping the mouthpiece clean and the whole setup contained. It's one of the better storage solutions for portable vaping.
How long does the battery last between charges?
Depends on your usage. The compact size means a smaller battery than full-size mods. For a few sessions a day, you're fine. Heavy users might need to charge daily. Keep a cable at your desk or in your bag if you're a frequent vaper.