Yocan UNI 3.0 Review

Background 

The Yocan UNI 3.0 is the latest evolution of what might just be the best-selling 510 battery ever. The UNI series has been a around for over a decade, with multiple upgrades along the way, and it’s practically everywhere you look.

The Yocan is a simple and reliable battery that can adapt to work with any cart- tall or short, fat or slim. I’ve burned through three or four carts with mine already, and in this quick four-minute review, I’ll break down the design, highlight the features, and stack it up against a couple of other options on the market. 

Design & Features  

The kit comes with the battery and a small 510 adapter. You screw this adapter onto your cart’s threads, turning the connection magnetic instead of threaded. 

It snaps into place and while it seems that’s a little wobbly at first, as I twist the top ring, and a hexagonal grip closes around the cart like a camera shutter, locking it tight. 

A latch at the bottom slides up or down to adjust for different cart lengths. I tested it with 0.5g and 1g carts, but it’ll likely handle 2g or even 3g, too. The opening’s 16mm wide, so as long as your cart fits, you’re good.

Instructions / How to use?

Once loaded, it’s the classic five clicks to power on, and the screen lights up. 

Now, I’m usually not a fan of screens on 510 batteries—they can feel gimmicky—but Yocan did well with this one. It’s subtle, not overly bright, and blends into the design without screaming for attention. 

The up and down buttons let you tweak the voltage from 1.8V to 4.2V. The display also shows battery life, ohm resistance (which I’ll skip for now), and a puff counter you can reset by holding the power and down buttons together. 

Three clicks opens a menu with three screen styles: Digital (the default), Planet, and Shinycat—whatever that’s supposed to mean. Each swaps the graphic when you fire it up. 

Two clicks kicks off a 10-second preheat mode at 1.8V, which is good for pulling dense, full clouds right from the first hit—no need to prime or pump the air. It’s smooth and consistent. 

At first glance, it might look a bit complex, especially with the screen, but don’t let that fool you. This thing’s straightforward and user-friendly. Some people (me included) shy away from batteries with displays, but the UNI keeps it simple and executes it well. 

Yocan UNI 3.0 VS. Randy’s

Its main competitors are the Randy’s XL and maybe the Ccell Fino, here is how they compare.

By the way, that VG10 code from VGEAR.com works on all these batteries. You can also Google ‘Vapeguy 510 batteries' for my top picks in 2025, plus more codes. 

• First difference: the Yocan leaves the cart partially exposed, while the Randy’s hides it inside the body. That’s great if you want to disguise it as, say, an Elf Bar, but I prefer drawing straight from the cart—not through an indirect mouthpiece. Point to Yocan for my taste. 
• Second, the Randy’s is draw-activated, while the UNI uses a button. I’ll take the button every time—it gives you complete control. With draw-activated batteries, you can’t keep inhaling after the heat is disengaged, and I like that flexibility.

Bottom line

After a few weeks with the UNI 3.0, it’s become my go-to. I’ll be honest—most Yocan products don’t impress me, to say the least. But every now and then, they knock out a good one, and this is one of those times. It’s simple, reliable, and gets the job done—everything I want in a 510 battery.

At $45, it’s well worth the price and easily outperforms similarly priced batteries.