Introduction
Most cheap 510 batteries are forgettable. Fixed voltage, no features, build quality that makes you wonder how long it'll last. The Ooze Slim Twist is different. For under $15, you get variable voltage and a preheat function. Most competitors at this price? Neither.
What We Tested
Our hands-on testing methodology
Unit Tested
Slim Twist (Rainbow)
Testing Period
6 days of use
Voltage Range
3.3V - 4.8V tested
Cartridges Tested
4 different carts
Battery Life
320mAh capacity
Features Tested
Preheat, twist dial
If you're new to cartridges or just need a solid backup, the Slim Twist does what matters without overcomplicating things.
Design and Build
Standard pen shape with the cartridge sticking out the top. Lightweight, but it doesn't feel cheap. The twist ring at the base is how you adjust voltage, which is the whole point of the "Twist" name.
Lots of color options here, including some rainbow chrome finishes. Helpful if you want to spot your battery in a drawer full of similar-looking devices.
One button does everything. Five clicks for on/off, hold to fire. The LED shows your voltage level and battery status.
Variable Voltage Control
Twist the base ring to adjust voltage anywhere from 3.3V to 4.8V. No preset levels, just smooth adjustment. Here's what the range actually means:
Low (3.3V-3.8V): Best flavor, lightest vapor. Good for quality distillates and live resin carts where you want to taste what you paid for.
Medium (3.8V-4.2V): The sweet spot for most cartridges. Solid vapor, flavor still comes through.
High (4.2V-4.8V): Big clouds, stronger throat hit. Use this for thick oils that need extra heat to flow right.
Because it's continuous, you can dial in exactly where a specific cartridge hits best. That's something you don't get with cheaper batteries locked to three preset voltages.
Preheat Function
Double-click to start a 15-second preheat at low voltage. Simple, but it solves real problems:
- Cold weather: Oil gets thick when it's cold outside. Preheat warms it up.
- Thick concentrates: Some distillates won't flow without a little heat first.
- Clogged carts: Gently loosens stuck material without burning it.
Most batteries under $20 skip preheat entirely. Having it here is a nice bonus.
Battery and Charging
Here's the tradeoff: 320mAh isn't much. Moderate users will charge daily. Heavy users might need to plug in twice. That's the cost of keeping it slim.
Micro-USB charging, 1-2 hours to full. There's overcharge protection built in, and an auto-off kicks in after 15 seconds of continuous firing. Keeps you from accidentally burning through a cart or killing the battery.
Who Should Buy the Ooze Slim Twist
First-time cartridge users: Low risk at this price, and variable voltage lets you figure out what settings you actually like.
Anyone who needs a backup: Under $15 means you can grab one, charge it, and forget about it until you need it.
Budget shoppers: Getting variable voltage and preheat for this money is unusual. The Slim Twist punches above its weight.
People who care about color: Way more options than most budget batteries offer.
Final Verdict
The Slim Twist proves you don't have to pay $40+ to get variable voltage and preheat. Those features make a real difference, and having them at $15 is why this battery stands out.
Yes, the battery is small. Yes, your cartridge sits exposed. But if you want simple, affordable vaping with actual control over your voltage, this does the job.
Good starter battery. Good backup. At this price, it doesn't owe you anything.