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WARNING: This Product Contains Nicotine. Nicotine is an Addictive Chemical.
WARNING: This Product Contains Nicotine. Nicotine is an Addictive Chemical.
Hellvape Fat Rabbit Review: Top and Bottom Airflow My Vpro

Hellvape Fat Rabbit Review: Top and Bottom Airflow

Product intro and specs

The Fat Rabbit is a sub ohm tank designed by Hellvape and popular YouTube vape reviewer Vapin Heathen. Heathen is best known for his work on the Dead Rabbit RDA, which was one of the most popular drippers released by Hellvape. The Fat Rabbit is considered a cousin of the Dead Rabbit, so it shares the family name, but they are two different types of devices. The Fat Rabbit is a direct lung tank that uses pre-made Baby Beast compatible coils. The kit includes a 0.2-ohm mesh coil and a 0.15-ohm quad OCC coil, which are available in packs of three.

The most unique feature of the Fat Rabbit is its dynamic airflow system. It features airflow on both the top and the bottom of the tank, so you can pick one, or rock both of them. The tank is designed in such a way that whether you’re using the top or bottom airflow, the air is directed straight to the coil head. The Fat Rabbit utilizes a rather old school top filling system where you unscrew the top to reveal its massive fill ports. The tank holds 5 mL of e-liquid or 2 mL using the straight glass section.
Price: $24.95 (Here)
Colors: Gunmetal, stainless steel, rainbow, black (white logo), full black


  • Diameter: 25 mm (base)
  • 28 mm (tank section)
  • Hybrid airflow structure
  • Dual-airflow cooling system
  • Top-thread refill system
  • Installed coil: HellcoilTM single-mesh (H7-02)
  • Spare coil: Quad OCC (H7-03)
  • Capacity: 2 mL or 5 mL with optional bubble glass
  • Knurled grip to remove top cap and refill
  • Drip tip: antibacterial 810 and 510 adapter
  • Adapted to Hellcoil H7-01/H7-02/H7-03

Kit contents

  • Fat Rabbit sub ohm tank
  • 0.15-ohm Quad OCC coil
  • 0.2-ohm single mesh coil
  • Hellvape sticker
  • Accessories bag
  • Spare bubble glass
  • Instruction manual

Build quality and design

The tank is chunky and robust. It’s constructed of stainless steel and the tank section is made of Pyrex. There is knurling on both the top fill section and bottom airflow section, which gives it an industrial look. I received the tank in gunmetal, but it also comes in stainless steel, rainbow and two varieties of black. Hellvape is doing the antibacterial drip tip thing now, which is pretty cool. I’m not a fan of the grey color, but the black one looks awesome. The tank accommodates my favorite acrylic Half Moon Goon-style drip tip because it has an internal O-ring. It also comes with an adapter for all you 510 drip tip nuts.

When I first took it out of the box, the airflow controls were extremely stiff. Then, I managed to crack the bubble glass within a few minutes of opening it. I accidentally over-tightened the tank just trying to get the airflow port open. Be careful when assembling the tank so that doesn’t happen to you!

There was some glue residue on the tank and glass section when I received it. Based on other reviews I’ve seen, that’s pretty common with this tank. I was able to clean it off with alcohol, but I wasn’t too happy about it. If I paid $25 for the tank, I would have been even less thrilled about it. It’s actually really well constructed in terms of the machining, but Hellvape definitely dropped the ball in terms of quality control. The threads are nice and smooth, but the O-rings break fairly easily. I suspect Hellvape might be aware of this, seeing as they include a ridiculous heap of O-rings with the Fat Rabbit.

It also has a bit of girth to it, and weighs just over 60 grams. The tank is 25 mm in diameter, but it bulges out to 28 mm in the middle, or 32 mm with the included bubble glass section. I ended up using the 2 mL straight glass tube, which I am being a lot more cautious with. I’m surprised they didn’t go with an easier top fill system with some kind of slide or twist system though. The bubble glass holds 5 mL of liquid, versus the 2 mL capacity of the straight glass. If you switch flavors a lot, the 2 mL can work to your advantage because you will be refilling it quite often, especially at 80 watts. Also keep in mind that you can’t change the coil when the tank is full, so make sure it is relatively empty.

Hellvape Fat Rabbit coil heads

If you’re familiar with the SMOK Baby Beast coil heads, the Hellvape coils are very similar. They are not only cross-compatible with each other, but they pretty much perform the same. Hellvape either “modeled” their coils after the SMOK Baby Beast coils, or they are literally just a rebranded version of them. Either way, if you’re familiar with the Baby Beast coils, you’ll feel right at home with these coils.

  • 0.2-ohm H7-02 Single Mesh Coil – rated for 80 watts
  • 0.15-ohm H7-03 Quad OCC Coil – rated for 80 watts

The coils go for about $10 per pack of three, which is a little bit more expensive than the SMOK ones, which cost around the same but come in packs of 5. There are currently two types of coils, both are included with the tank.

The mesh 0.2-ohm coils produce better flavor and last longer than the 0.15 quad coils. They are both rated for up to 80 watts and use cotton wicking. The tank allows you to see straight down the chimney to check on the health your coil. Especially with the mesh coil, you can really see when it starts gunking up and the cotton starts becoming darker. It comes in handy for knowing when your coil is saturated. From my experience it takes about five minutes and requires about five or six puffs to break in the flavor. Switching flavors wasn’t that bad, but there is a period where the last flavor will carry over, so you’ll have to plan your flavor transitions wisely.



The Fat Rabbit provides more than enough airflow for direct lung vaping. There are two air slots, one on the bottom and one on top. The top airflow slot is a bit more restrictive than the bottom one. The way the tank is designed, the air flows from the top, then through the bottom of the tank, then back up to the coil. The flavor is similar whether you’re using the top or bottom airflow.

The draw is smooth and relatively quiet. It isn’t exactly silent, but it doesn’t whistle or anything and it isn’t very turbulent. The airflow adjustment was really tight when I got the tank, but after breaking it in, it’s actually perfect now. I would have liked to see knurling on the top airflow as well, but that’s not a big deal. If you’re using the device at its max wattage, the extra airflow comes in handy. For a restrictive lung hit, I like the top airflow closed off about half way.

The dynamic airflow configuration is innovative and all, but I don’t know if it was necessary. The whole point of top airflow is to prevent leaking, so it seems a bit counterintuitive to include both, but I give them props for trying something different. If you’re looking for an extra amount of airflow, you might appreciate the additional air slots on the top of the tank.

Hellvape Fat Rabbit performance

I mostly tested the Fat Rabbit using the mesh coil. I don’t do a lot of direct lung vaping these days so when I do, I’m in it for the flavor. The tank performs like a SMOK Baby Beast, which you may already be familiar with. The vapor output is good, especially at 80 watts, but nothing spectacular. I mostly stayed within the 55-65 watt range using the 0.2-ohm coil and the airflow no more than half way open. It gave me a warm vape without being too hot. The e-liquid I used was Vapetasia Pink Lemonade in 3 mg, which contains 70% VG. The flavor was acceptable, but it doesn’t compare to the better sub ohm tanks out there right now like the Geekvape Alpha or the OFRF NexMesh for example.

I used the tank for a little over a week and the only time I had any kind of leaking was when I was traveling with it in my backpack. It wasn’t anything major, just a few drops. I just wiped the tank with a napkin and I was good to go. I didn’t get any dry or burnt hits at all with the mesh coil, but the quad coils dip off in performance within a couple of days, to a week if you’re lucky. The Fat Rabbit isn’t a juice guzzler, but you can blast through 5 mL pretty quickly if you’re running it at 80 watts. You wouldn’t want to use the 2 mL glass tube at such a high wattage because you’ll be refilling it constantly.

I didn’t have any issues with spit back or gurgling whatsoever. The coils wick and perform how they should. I get a really loud pop if I don’t use the tank for a long time, especially if it’s cold. One morning I took a first puff on it and I was actually startled by a tremendous pop. Not a big deal, but worth mentioning. All in all, it performs the way a sub ohm tank should, so it’s hard to complain.

Pros / Cons

  • (+) Top and bottom airflow options
  • (+) Smooth and airy direct lung draw
  • (+) Compatible with SMOK coils
  • (+) Antibacterial drip tip
  • (+) Compatible with most drip tips
  • (+) Robust construction
  • (-) Outdated top filling system
  • (-) Can’t change coil with a full tank
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