The CUKTECH 15 Ultra Power Bank is a device that’s quickly becoming my new favorite gadget. With a whopping 20,000mAh capacity and the ability to deliver up to 210W of total output, this thing is built to handle everything from your smartphone to your laptop, and even some film gear if you’re into that kind of thing. And let’s not forget its insane charging speed—both for itself and the devices it powers. Seriously, with dual input ports that allow for a combined 165W charging input, this power bank can go from empty to fully charged in just 45 minutes. How cool is that?
But what really sets the CUKTECH 15 Ultra apart isn’t just its raw power; it’s the little details that make it stand out. Like the sleek design that fits comfortably in your hand (even though it packs a punch in terms of weight), or the smart 1.3-inch TFT display that gives you real-time info on charging status, battery percentage, and even temperature warnings. It’s almost like having a mini command center right at your fingertips.
And honestly, after using this power bank for a while now, I can confidently say it’s one of those gadgets that makes you wonder how you ever lived without it. From charging multiple devices simultaneously to supporting a wide range of fast-charging protocols, it feels like CUKTECH thought of everything.
Design and Build Quality
The design and build quality of the CUKTECH 15 Ultra Power Bank, there’s a lot to unpack—and trust me, this thing is as impressive on the outside as it is on the inside. First off, let’s talk about its overall look and feel. The CUKTECH 15 Ultra has what I’d call a “chocolate bar” design—sleek, compact, and just the right amount of modern minimalism. It’s not flashy or over-the-top, but it definitely doesn’t scream “cheap” either. In fact, it feels like something you’d be proud to pull out in front of your tech-savvy friends at a coffee shop or while traveling.
The power bank is made mostly of hard plastic, which might sound like a downside at first, but hear me out—it’s actually done really well here. The exterior has a nice matte finish that resists fingerprints (a small but appreciated touch), and the back even has a textured grip. Now, it’s not rubberized, so don’t expect it to stick to your hand like some other grippy power banks, but it still gives you enough traction to hold onto comfortably without worrying about it slipping out of your grasp. That’s especially important because, let’s face it, this thing isn’t exactly feather-light. With all those cells packed inside to give you that massive 20,000mAh capacity, it does have some heft to it—but honestly, that weight just makes it feel solid and premium. You know how sometimes you pick up a product and think, “Oh, this feels cheap”? Yeah, that’s not happening here.
Now, one of my favorite things about the design is how portable it is despite its power. Sure, it’s not pocket-sized unless you’re wearing cargo pants with extra-deep pockets, but it’s still pretty compact for what it can do. Think about it: we’re talking about a power bank that can charge laptops, phones, tablets—all at the same time—and yet it’s roughly the size of a Red Bull can. That’s insane when you really stop to think about it.
Let’s zoom in on the front for a second because that’s where things get really interesting. Right smack in the middle, you’ve got this awesome 1.3-inch TFT display. Now, I know some people might think, “Do I really need a screen on my power bank?” But trust me, once you’ve used one with a display like this, you’ll never want to go back. This little screen is like having a mini dashboard for your charging needs. It shows you everything from the current battery percentage to real-time input/output details for each port. So if you’re charging multiple devices at once, you can see exactly how much power each one is pulling. And if you’re recharging the power bank itself, it’ll even tell you how long it’ll take to hit 100%. How cool is that? Plus, the display is bright enough to read easily, even in daylight, but not so bright that it becomes annoying indoors.
Another standout feature of the design is the button located near the display. At first glance, it might seem like just another power button, but it’s way more versatile than that. A quick press toggles through different modes, showing you detailed info about each port’s activity. Hold it down, and you can dive into settings like switching between input/output modes for the USB-C ports or adjusting the screen brightness. There’s even a double-press function to enable low-current mode, which is perfect for charging smaller gadgets like earbuds or fitness trackers.
Speaking of ports, they’re neatly arranged along the top edge of the power bank. You’ve got two USB-C ports and one USB-A port, and while they may look similar at first glance, each serves a unique purpose. The first USB-C port supports both input and output, meaning you can use it to charge the power bank itself or plug in a device to charge. The second USB-C port also supports input/output, but it’s optimized for slightly lower-powered devices. Meanwhile, the USB-A port is great for legacy devices or anything that doesn’t use USB-C yet. Having all three ports side-by-side keeps things clean and organized, and the labeling is subtle but clear enough that you won’t accidentally plug something into the wrong spot.
Lastly, I want to touch on durability. One thing that stood out during my testing was how well-built this power bank feels after weeks of regular use. Despite being tossed around in bags, carried on trips, and generally put through its paces, it still looks almost brand new. No scratches, no scuffs, nothing. Even the included carry pouch (which, by the way, is a nice bonus) helps keep it protected when you’re on the move. Oh, and did I mention it’s flame-retardant? Yeah, apparently the materials used are designed to prevent overheating or catching fire, which is always reassuring when dealing with high-capacity batteries.
Charging Capabilities
First, let’s talk about the ports because that’s where all the magic happens. The CUKTECH 15 Ultra has three ports: two USB-C ports and one USB-A port. Now, you might think, “Okay, so it’s got the usual suspects,” but trust me, these aren’t your average ports. Each one is designed with specific tasks in mind, and they work together seamlessly to handle pretty much any device you can think of.
- USB-C Port 1 (The Heavy Lifter): This is the star of the show. It supports an insane 140W output, which means it can charge high-powered devices like laptops, gaming consoles, or even some monitors. If you’ve got a MacBook Pro or a similar powerhouse, this port will get it from near-dead to half-charged in no time. Seriously, I tested it with my MacBook Air M1, and it went from 0% to 24% in just 30 minutes. That’s not something you see every day.
- USB-C Port 2 (The Middle Child): This one is a bit more modest, offering up to 90W of output, but don’t underestimate it. It’s perfect for tablets, smaller laptops, or even fast-charging phones. If you’re using both USB-C ports at the same time, the power bank intelligently splits the wattage between them, so you’re still getting decent speeds on both devices. For example, if you’re charging a laptop on Port 1 and a phone on Port 2, the laptop might pull 100W while the phone gets around 45W. It’s smart like that.
- USB-A Port (The Legacy Hero): Now, not everyone has jumped on the USB-C train yet, and that’s where the USB-A port comes in. It supports up to 33W of output, which is plenty for most older devices or even some modern phones that still use USB-A cables. What’s cool is that this port also supports Xiaomi’s HyperCharge tech, meaning if you’ve got a Xiaomi device that can handle 120W fast charging, this port will recognize it and give it the juice it needs. It’s like having a built-in compatibility mode for older gadgets.
Simultaneous Charging
One of the things that really impressed me about the CUKTECH 15 Ultra is how well it handles multiple devices at once. A lot of power banks out there will slow down when you plug in more than one device, but not this one. Thanks to its intelligent power distribution, it can deliver a total output of 210W across all three ports without breaking a sweat.
For example, I tried charging my MacBook Air, an iPad, and an iPhone all at the same time. The MacBook was pulling around 60W, the iPad was getting about 45W, and the iPhone was happily sipping 18W. None of them slowed down or had issues switching between charging states, which is something I’ve noticed with other power banks. The CUKTECH 15 Ultra just keeps humming along, delivering consistent power to each device.
Fast Charging Protocols
Another thing that makes this power bank stand out is its compatibility with a wide range of fast-charging protocols. Whether you’re using a Samsung Galaxy, an iPhone, or even some niche Chinese brand, the CUKTECH 15 Ultra knows how to talk to your device and give it exactly what it needs. Here’s a quick rundown of the protocols it supports:
- PD 3.1 (Power Delivery): This is the gold standard for fast charging, especially for laptops and newer smartphones. With PD 3.1, you can get up to 140W of power through the first USB-C port, which is perfect for devices like the MacBook Pro or even some gaming laptops.
- QC (Quick Charge): If you’ve got a phone that uses Qualcomm’s Quick Charge tech, you’re covered too. The power bank can deliver up to 33W through the USB-A port, which is enough to get most QC-enabled devices charged up quickly.
- UFC (Universal Fast Charging): This is Xiaomi’s proprietary fast-charging tech, and the CUKTECH 15 Ultra nails it. If you’ve got a Xiaomi phone that supports 120W HyperCharge, this power bank will recognize it and deliver the full 120W through the USB-A port. That’s crazy fast, and it’s one of the reasons why Xiaomi fans are going to love this thing.
Self-Charging
Now, here’s where things get really interesting. Most power banks take forever to recharge themselves, especially if they have a big capacity like the CUKTECH 15 Ultra’s 20,000mAh. But this power bank has a trick up its sleeve—it supports dual input charging. That means you can plug in two chargers at the same time to juice it up super fast.
For example, if you’ve got a 65W charger and a 100W charger lying around, you can plug both into the two USB-C ports, and the power bank will pull a combined 165W of power. This is what the company calls “Beast Mode,” and it’s not just marketing fluff—it actually works. In my tests, I managed to fully charge the power bank in just 45 minutes using this method. That’s unheard of for a power bank this size, and it’s a game-changer if you’re always on the go and need to top up quickly.
Low-Power Mode
One last feature worth mentioning is the low-power mode , which you can activate by double-pressing the power button. This mode is ideal for charging smaller devices like earbuds, fitness trackers, or even smartwatches. It ensures that these low-power devices get just the right amount of juice without overloading them. It’s a small feature, but it shows how much thought went into designing this power bank.
Performance Testing
One of the first things I wanted to test was how well the CUKTECH 15 Ultra performs when charging some of the most popular devices on the market today. I tested it with a range of gadgets, from smartphones to laptops, and here’s what I found:
iPhone 16 Pro
- Claimed Max Charge Speed: 30W (Apple’s official max for fast charging)
- Actual Performance: The CUKTECH 15 Ultra delivered a consistent 27-30W charge when using the included 6A USB-C cable. In just 30 minutes, my iPhone went from 0% to 60%, which is exactly what Apple promises with their fast charging tech.
- Observations: The power bank recognized the device immediately, showing “Apple 6A Cable” on the TFT display. This level of detail is something you don’t see on many other power banks, and it’s a nice touch for tech enthusiasts who want to know exactly what’s going on under the hood.
Samsung Galaxy S24 Ultra
- Claimed Max Charge Speed: 45W
- Actual Performance: The power bank delivered around 24-25W when connected via the USB-A port. While it didn’t hit the full 45W, this is still pretty solid considering that Samsung devices tend to throttle charging speeds depending on the source.
- Observations: The phone charged from 0% to 62% in 30 minutes, which aligns with Samsung’s claims. The power bank’s display showed the exact voltage and current being delivered, giving me peace of mind that everything was working as it should.
Xiaomi Redmi Note 13 Pro+
- Claimed Max Charge Speed: 120W (HyperCharge)
- Actual Performance: This is where the CUKTECH 15 Ultra really shines. When using the USB-A port, the power bank successfully delivered 120W of power, fully charging the Redmi Note 13 Pro+ in just 19 minutes. That’s insanely fast, and it’s one of the reasons why Xiaomi fans will love this power bank.
- Observations: The power bank’s display clearly showed “Xiaomi 6A Cable,” confirming that it recognized the device and was delivering the maximum possible charge speed. If you rely on Xiaomi’s HyperCharge tech, this power bank is a no-brainer.
MacBook Pro 16-inch (M3 Chip)
- Claimed Max Charge Speed: 140W
- Actual Performance: The CUKTECH 15 Ultra delivered a steady 60-70W when charging my MacBook Pro, which was enough to get it from 0% to 53% in just 30 minutes. While it didn’t hit the full 140W, this is still more than enough to keep your laptop running during long work sessions or travel.
- Observations: The power bank’s intelligent power distribution ensured that the MacBook was getting priority, even when I plugged in other devices simultaneously. More on that later.
Long-Term Use
After using the CUKTECH 15 Ultra for several weeks, I can confidently say that it holds up well over time. The battery capacity remained consistent, and there was no noticeable degradation in performance. Even after multiple cycles of charging and discharging, the power bank continued to deliver the same fast speeds and reliable performance.
For Heat Management, the power bank stayed relatively cool during extended use, thanks to its advanced safety features like temperature control and overcurrent protection.
Safety and Reliability
The CUKTECH 15 Ultra is packed with nine layers of safety protection, which is a standout feature that really sets it apart from the competition. These protections cover everything from temperature control to overcurrent prevention, ensuring that your devices—and the power bank itself—are always safe during use. Here’s a quick rundown of what these safety features include:
- Temperature Control: The power bank monitors its internal temperature in real-time, and if things start to heat up too much, it will automatically adjust the charging output to prevent overheating. This is especially important when charging high-powered devices like laptops or gaming consoles.
- Overcurrent Protection: If the power bank detects that too much current is being drawn—perhaps because of a faulty cable or device—it will cut off the power to prevent any damage to your gadgets.
- Short Circuit Prevention: Accidents happen, but the CUKTECH 15 Ultra has built-in safeguards to prevent short circuits, which could otherwise lead to serious issues like battery failure or even fire.
- Voltage Protection: Whether you’re charging a phone or a laptop, the power bank ensures that the voltage remains stable, preventing any sudden spikes or drops that could harm your devices.
- Flame-Retardant Materials: The exterior of the power bank is made from flame-retardant materials, adding an extra layer of safety in case something unexpected happens. This is a small but crucial detail that gives you peace of mind, especially if you’re traveling or using the power bank in less-than-ideal conditions.
Real-Time Safety Alerts via the TFT Display
One of the coolest things about the CUKTECH 15 Ultra is how it keeps you informed about potential safety issues through its 1.3-inch TFT display. This isn’t just a fancy screen for showing wattage and charging speeds—it’s also a built-in safety monitor.
For example:
- If the power bank starts to overheat, the display will show a temperature warning, alerting you to unplug it or stop charging until it cools down.
- If there’s an issue with one of the ports—like a short circuit or overcurrent—the display will notify you immediately, so you can address the problem before it becomes serious.
This level of transparency is something you don’t see in many other power banks, and it’s a big reason why the CUKTECH 15 Ultra feels so reliable. You’re not just blindly plugging in your devices and hoping for the best—you’re getting real-time feedback on what’s happening inside the power bank.
Intelligent Device Recognition
Another aspect of safety that’s worth mentioning is the power bank’s intelligent device recognition. When you plug in a device, the CUKTECH 15 Ultra doesn’t just blast it with power—it carefully analyzes the device and adjusts the charging speed accordingly. This is particularly useful for older or more delicate devices that might not be able to handle fast charging.
For instance:
- If you’re charging an iPhone, the power bank will recognize it and deliver the optimal voltage (usually around 9V), ensuring that your phone charges quickly but safely.
- If you’re charging a smaller device like earbuds or a fitness tracker, the power bank will switch to low-power mode, delivering just enough juice without overloading the device.
Dual Input Beast Mode
We’ve already talked about the dual-input Beast Mode, which allows you to charge the power bank itself using two separate chargers at once. But what’s really impressive is how safe this feature is. Even when you’re pumping 165W of power into the power bank, it doesn’t get excessively hot or unstable. The internal safety mechanisms ensure that the power bank can handle this kind of rapid charging without any risk of overheating or damage.
In my testing, I used a 65W GaN charger and a 100W GaN charger simultaneously to recharge the power bank, and the entire process took just 45 minutes. During this time, the power bank stayed relatively cool, and the display showed the exact wattage being delivered at all times.
Final Thoughts
In conclusion, the CUKTECH 15 Ultra Power Bank is one of the most impressive power banks I’ve ever used. From its sleek design and robust build quality to its jaw-dropping charging capabilities and advanced safety features, it checks all the boxes for what you’d want in a premium power bank.
Priced at $89.95 in the UK and $99.99 in the US, which places it firmly in the mid-to-premium range of power banks. Now, some people might look at that price tag and think, “Wow, that’s a lot for a power bank!” But here’s the thing: when you consider what you’re getting, it’s actually a pretty solid deal.
For starters, this isn’t just any ordinary power bank. With its 20,000mAh capacity, 210W total output, and dual-input Beast Mode that allows for rapid self-charging, the CUKTECH 15 Ultra is packed with features that most other power banks simply don’t offer. To put it into perspective, many high-end power banks with similar specs (if you can even find them) often cost well over $120 or $130. So, at under $100, the CUKTECH 15 Ultra is actually quite competitively priced.
Whether charging a single device at max speed or juggling multiple gadgets at once, the CUKTECH 15 Ultra handles everything easily. The dual-input Beast Mode is a standout feature that sets it apart from the competition, allowing you to recharge the power bank itself in just 45 minutes—a feat that’s almost unheard of in this category. And with its 210W total output, you can charge laptops, phones, tablets, and even film gear without breaking a sweat.
The 1.3-inch TFT display adds an extra layer of convenience, giving you real-time information on charging status, battery percentage, and even temperature warnings. It’s the kind of feature that makes you wonder how you ever lived without it.
