A Penjamin is a disguised 510 cartridge battery from Smyle Labs. The original looks and writes like a regular ballpoint pen, while hiding a 510 cart under a removable top cover. Click the button under the clip five times to turn it on, three times to change the temperature and twice for preheat.
Key takeaways
- “Penjamin” is the name of Smyle Labs’ line of disguised 510 batteries, starting with the Cart Pen.
- The Cart Pen is a working writing pen: twist the bottom to reveal the tip.
- Smyle says it fits most 0.5g to 1g cartridges and includes a 0.5g adapter.
- The line now includes a car key, a permanent marker, a raygun and other designs.
Where does the name Penjamin come from?
Penjamin is the name Smyle Labs gave its patented pen-shaped 510 battery, the Cart Pen. It now covers the whole family of disguised Smyle batteries, and many people use it for any pen-style hidden cart battery.
The idea is simple: a 510 battery that looks like something you would already carry. Instead of a typical pen battery, you get a real pen, a car key or a marker that also powers your cartridge.
What is in the Smyle Labs Penjamin line?
The Penjamin line covers several disguised designs. All of them work with standard 510 cartridges.
Original
Penjamin Cart Pen
Looks and writes like a ballpoint pen. Hidden cart under a removable top cover.
Keys
Car Key Penjamin
Shaped like a car key fob. A magnetic adapter holds the cart inside.
Novelty
Raygun Penjamin
A retro raygun with LED lights and sound effects. Fits all cart sizes, per Smyle.
More
Markers, wands and more
Smyle also makes marker, wand and other novelty batteries.
Disguised and discreet
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Penjamin Cart Pens, Car Keys, Rayguns and more. Free US shipping over $49.99.
How does a Penjamin work?
It is a 510 battery inside a pen body. You screw your cartridge into the top, cover it with the rubber cap so only the mouthpiece pops out, and use the button under the clip to power it.
How to use the Penjamin Cart Pen, based on Smyle Labs’ instructions.
Total time: 2 minutes
-
Remove the top cover
Take the rubber cover off the top of the Penjamin.
-
Insert your cartridge
Screw any 510 threaded cartridge into the connection.
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Replace the cover
Put the cover back on so the mouthpiece tip pops out of the top.
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Turn it on
Click the button under the pen clip five times.
-
Set temperature or preheat
Click three times to choose a temperature setting, or twice for preheat.
-
Write when you need to
Twist the bottom section counterclockwise to reveal the writing tip.
What voltage settings does a Penjamin have?
Smyle Labs lists three adjustable temperature settings and a preheat function for the Cart Pen and Car Key. Smyle does not publish the exact voltage values on its product pages.
Start on the lowest setting and move up if you want more vapor. Use preheat when the oil is thick or the cart has been sitting in a cool room.
What cartridges fit a Penjamin?
Smyle says the Cart Pen fits almost all 0.5g to 1g cartridges, and it includes a 0.5g cartridge adapter. The Car Key fits most 0.5g and 1g carts using a gold magnetic adapter.
| Model | Cartridge fit | Connection | Charging |
|---|---|---|---|
| Penjamin Cart Pen | Most 0.5g to 1g carts, 0.5g adapter included | Screw-in 510 | Micro USB cable included |
| Car Key Penjamin | Most 0.5g and 1g carts | Gold magnetic adapter | USB-C, about 15 to 30 minutes |
| Raygun Penjamin | All cart sizes, per Smyle | 510 | USB-C |
How do you charge a Penjamin?
Use the cable that came with it. The Cart Pen has a hidden charging port and includes a Micro USB charger, while the Car Key uses USB-C and charges in about 15 to 30 minutes, according to Smyle Labs.
- Charge on a hard surface and do not leave it charging unattended.
- Remove or loosen the cartridge if the maker recommends it for your model.
- Unplug once the light shows a full charge.
Is the Penjamin a real pen?
Yes. Smyle Labs designed the Cart Pen as a working writing pen. Twist the bottom part counterclockwise to reveal the writing tip, and it includes a removable grip for comfort. Replacement ink is sold separately by Smyle.
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How does a Penjamin compare to a standard 510 pen battery?
Both power the same 510 thread cartridges. The difference is the shell: a Penjamin hides the cart inside a working pen, while a standard pen battery leaves the cart exposed on top.
| Feature | Penjamin Cart Pen | Standard 510 pen battery |
|---|---|---|
| Look | Real writing pen | Battery tube with cart on top |
| Cartridge | Hidden inside the barrel | Exposed |
| Writes | Yes | No |
| Fits | Most 0.5g to 1g carts | Most 510 carts |
| Best for | Discretion and carrying | Simplicity and lowest cost |
If you want the lowest price and do not care how it looks, a basic 510 battery does the job. If you want something that blends in on a desk or in a pocket, the Penjamin is the easier carry.
How do you keep a Penjamin working well?
Keep the 510 threads clean, avoid overtightening the cartridge and store it upright when a cart is inside. A drop of residue on the connection is the most common reason a cart stops hitting.
- Wipe the threads with a dry cotton swab every few cartridges.
- Screw carts in until snug, not tight, to protect the center pin.
- Recharge before the battery runs fully flat.
- Keep it out of hot cars and direct sun.
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Frequently asked questions
What is a Penjamin battery?
A Penjamin battery is a 510 cartridge battery from Smyle Labs that is disguised as an everyday object. The original Cart Pen looks and writes like a regular pen, with the cartridge hidden under a top cover. It offers three temperature settings and preheat, and fits most 0.5g to 1g cartridges.
How do you use a Penjamin car key?
Remove the top of the car key, twist the gold magnetic adapter onto your cartridge and drop it inside, then replace the top. Press the unlock symbol five times quickly to turn it on, three times to change the temperature and twice for preheat. It charges by USB-C.
How do you turn on a Penjamin?
On the Cart Pen, click the button under the pen clip five times quickly. Once it is on, click three times to choose a temperature setting or twice for preheat. On the Car Key, press the unlock symbol five times to turn it on.
Does the Penjamin actually write?
Yes. The Cart Pen is a working writing pen. Twist the bottom section counterclockwise to reveal the writing tip. It also comes with a removable grip for writing comfort, and Smyle Labs sells replacement ink and tips separately.
What size carts fit in a Penjamin?
Smyle Labs says the Cart Pen fits almost all 0.5g to 1g cartridges and includes a 0.5g adapter. The Car Key fits most 0.5g and 1g carts with its magnetic adapter. The Raygun Penjamin is listed by Smyle as fitting all cart sizes.
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Hide your cart in plain sight
The Penjamin turns a pen, a car key or a marker into a 510 battery. Pick your favorite design in our Smyle Labs collection, starting with the Car Key Penjamin or the Cart Pen, or compare all 510 batteries.
