Yocan Kodo

The Yocan Kodo is a box-style 510-thread battery that does one thing and does it well. It exists to power pre-filled oil cartridges, and at the price Yocan is asking, it's hard to find fault with how well it handles that job.

The device is tiny — roughly the size of a lighter — and the rectangular form factor makes it more stable than the typical cylindrical 510 battery pen. It stands upright on a table without tipping over, fits easily in a pocket, and is light enough that you won't notice it's there. For someone who regularly uses 510-thread cartridges, that kind of portability matters.

The 400mAh battery is small by most standards, but it's appropriate for what the Kodo is. Heavy users will charge it once or twice a day, while lighter users might go two or three days between charges. Passthrough charging is a real benefit here — you can keep using the device while it charges, which removes the downtime that comes with some smaller batteries.

Voltage control is handled by a dial or button cycling through three levels: low, medium, and high. There's no digital display or precise temperature setting, which is fine for oil cartridges — most users find their preferred voltage quickly and stick with it. The preheat mode, activated by two clicks, helps loosen thick oils in cold weather. At 2 seconds to full power, the Kodo responds quickly.

Build quality is honest for the price. The device feels solid in hand, the 510 threading is clean, and the connection with cartridges is reliable. The one-year warranty is standard. This isn't a device that competes with variable-wattage mods or advanced battery systems — it's a low-cost, practical solution for 510-thread cartridges that gets out of the way and lets you use your oil without fuss.