YiHi SXmini MQ Class - Review By Ben28

[Ben28]

YiHi SXmini MQ Class ​

YiHi SXmini is a brand that I've wanted to try for a long time, and today, I finally bring you a review of one of their mods that has caught my attention especially for its size. We are talking about the MQ Class, a single 18650 mod with an incredibly small size, the smallest in my collection at least.

Thanks from here to Sourcemore for making this review possible. They have provided me with a code (SMCM) that reduces the price from $54.99 to $40.39. In addition, you can visit their page and learn more about this MQ Class.

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Specs​

Brand​	YiHi​
Product Name​	SXmini MQ Class Mod​
Chipset​	YiHi SX416J​
Battery​	Single 18650 battery (not included)​
Wattage​	1-60W​
Output​	1-8V​
Size​	36.7*76mm​
Quiescent Current​	≤20μA​
Min Ω​	0.10-3Ω​
Max Charge​	5V/2A​

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Packaging

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The device comes packaged in a rectangular box. In the center of it, we can see an image of the MQ Class. At the top and on the left, we can find some branding. Lastly, we find a warning about nicotine.

I can't say that this packaging excites me, but I don't dislike it either. It's really simple, although slightly elegant at the same time.

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On the back, we can quickly see the contents of the box:

1* MQ Class Device
1* Type-C Cable
1* User Manual
1* Warranty Card

We also find some features of the device and some warnings, but no excessive logos or contact addresses, which I find strange.

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Device Inspection

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This part of the review, specifically with this photo, is going to be really long, as I'm going to talk about its aesthetics, materials, functions, vaping modes...

Let's start with its aesthetics. I think YiHi SXmini has tried to go for a really simple but very elegant look. We can see how the body of the mod "separates," so to speak, from its top and bottom parts. A detail that I really like is the color change between the general body and the silver parts; it really gives it a very, very elegant aesthetic in my opinion. As for its materials, we find a combination of Stainless Steel and Aluminum, with the aluminum occupying the entire central part, that is, the black part in this case, and the Stainless Steel occupying the top and bottom. I like that they have chosen such a resistant material for the atomizer threading, as we don't want to encounter the misfortune of it coming loose after a while.

If we look at the mod, we can see how it is divided into two parts; on the left is the entire battery compartment, and on the right is the chip (YiHi SX416J) in addition to all the electronics, buttons, and the screen.

Let's move on to the feel of the buttons now. I would assume they are made of aluminum, just like the body of the mod. The fire button has a travel that is neither too short nor too long, let's say it's something in between. As for the wattage up and down buttons, they have a much shorter and "crisper" travel, so to speak. Both feel really good and have a very addictive click.

Let's try to move on to the functions in the most orderly way possible:​

• 5 Clicks to turn on the device.​
• With the wattage up and down buttons, we can increase or decrease the wattage in steps of 0.1W up to 25W, from there it goes in steps of 1W up to a maximum of 60W. Once it reaches the maximum, it warns us with "MAX OUTPUT" and it doesn't have a cycle, that is, it doesn't return to its minimum (1W), something curious, although we could say intelligently, is that once we have reached 1W, if we lower the wattage again, we go to 60W, that is, it does have an "inverse cycle."​
• 5 Clicks once turned on will take us to a menu, where we can navigate using the wattage adjusters;​

- Mode
- Curves
- Shutdown
- Exit (from the menu)
- Brightness
- Update (for updates and more)

As it seems to me that this part is getting quite, quite long, I'm going to leave the modes and curves for the next image. Let's move on to explain the other functions:​

• Brightness, as the name suggests, we can change the brightness of our screen. The brightness is configured so that 1 is the lowest possible and 5 is the highest. I generally keep it at 5 as I think it's not noticeable and it's not worth keeping it at 1 just to gain some extra battery life.​
• Update, there is nothing available for now, but I suppose it will serve in the future to update the firmware of the device.​

 

[Ben28]

Let's briefly talk about the screen and its information, and then we'll move on to the vaping modes and curves.

Well, the screen is very, very simple but gathers all the necessary information, nothing more than that. We can observe:​

• Battery indicator.​
• 4-digit puff counter.​
• Power indicator, in Watts or Volts.​
• Ω indicator.​
• Voltage indicator, if we are in Wattage mode.​

Well, a curiosity, so to speak, is that at the beginning of each puff, instead of the puff counter, the name of the curve we are using is displayed, and speaking of curves, I take the opportunity to link it and specify what it is about.

Many devices have it, one example that quickly comes to mind is GeekVape, but this MQ Class has made me actually use them because, in my opinion, they are much better implemented than those of other devices. It is a power curve, that is, we can start at, let's imagine, 55W and have it decrease progressively as the puff time increases, and vice versa. The device comes with three pre-configured curves:​

• Soft, starts at 75% of the power we set and progresses gradually up to the indicated value. That is, if we vape at 42W with the soft curve, the first half-second of the puff is at 25.2W, the second half will be at 29.4W, and so on.​
• Normal, is the "no curve" mode, it maintains the power linearly.​
• Hard, starts at 125% of the power we set and gradually decreases to 100%.​

However, if this were not enough, this chip and its electronics allow us to configure three custom curves, named SXi-EQ1, SXi-EQ2, SXi-EQ3. The curves are made up of 20 slots, and as I understand it, each slot represents 0.5 seconds of puff, that is, 10 seconds in total. The curves can be guided by percentages; they are programmed this way. Being completely configurable by the user, I'm not going to delve much further into the topic; everyone is free to configure it completely as they want and to their liking.

Well, let's talk about modes now:​

• Wattage Mode, the classic Wattage mode, shows us the screen information in the image above.​
• Voltage Mode, the same as Wattage but with Volts.​
• Temp Mode, the screen information changes, replacing the power with limit degrees. On the right side is where we now find the power in watts. It is valid for coils with SS316L, NI200, or TCR materials. When entering this mode, it asks us for the ambient temperature of the room, as well as whether we want to choose Celsius or Fahrenheit.​
• VT Coil Mode, this is a specific mode for YiHi SXmini VT coils, they promise an Anti Dry Hit with this mode, something I haven't been able to test at all.​

Something curious and that I didn't expect at all is that, to reset the puff counter, we must connect the device to a USB-C. Nothing else is needed; we connect it, disconnect it, and we have already reset the counter to 0. Something strange, honestly. I think they could have added an extra option in the menu and that's it.

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Let's talk about the atomizer threading now. As can be seen in the image, the top part is anchored with two "star" screws. In the atomizer threading area, we find what is, for me, like the sight of a weapon, so to speak. Atomizers screw on without any problems and so far do not leave any kind of mark. Furthermore, thanks to its material, it seems like a very resistant area, although I don't know if the attachment will be sufficient. After 2100 puffs, I can say yes, but I don't know how it will hold up over time. Also, this mod is capable of holding atomizers up to 24mm, and these are the ones that fit best as they cover the entire surface.

Now we move on to the area I like the least and that scares me the most about this mod: the threading of the battery compartment. I have always, but always, been afraid of these threads, because it seems to me that depending on the material they are made of, they can be ruined quickly. In fact, sometimes it engages and turns great, but sometimes it has a small stumble, and this is a piece of information to take into account if it's a mod we want to keep for a long time. On the other hand, I should say that screwing it in slightly already makes the mod work, and it is usually recommended to screw it in until the screen turns on and works; this way, we don't press the battery too hard (of course, with caution, without it being able to fall out).

Regarding battery life, I can say that it drains them down to exactly 3.20V, just as advertised in the specs. This means it tries to get the most out of them, and it shows.

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Here I show you a photo in comparison with what used to be my favorite mod (yes, this MQ Class has taken its place). The BP Mods Warhammer was the smallest mod I had in my collection without any doubt, but this one surpasses it; it's smaller in both height and width.​

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Pros And Cons​

Pros​	Cons​
Extremely Small Size​	Battery Compartment Threading Concerns​
Elegant Aesthetics​	​
Resistant Atomizer Threading​	​
Really Good and Precise Chip​	​

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Conclusion​

The YiHi SXmini MQ Class is an impressively tiny single 18650 mod packed with advanced features. It's got a simple but classy look and feels well-built with stainless steel in important spots. The accurate YiHi SX416J chip gives you lots of vaping modes and really detailed power curve adjustments, great for all vapers. Sure, the puff counter reset is a bit odd, and the battery threading has a minor quirk, but overall, it's a smart and stylish little mod that doesn't skimp on tech. If you want something super portable but still powerful and customizable, the MQ Class looks like it will fit you.​