I’ve been using the KUXIU K1 Ultra 10,000mAh for the past couple of weeks, and I think this is one of those products where the idea makes a lot of sense as soon as you travel with several Apple devices.
It is basically a magnetic iPhone power bank, Apple Watch charger, AirPods charger and small phone stand combined into one device.
The main reason it interested me was actually the Apple Watch part. Traveling with an Apple Watch is slightly annoying because even when almost everything else in my bag uses USB-C, I still have to remember a separate Watch charger.
With this, I essentially have an Apple Watch power bank, which is surprisingly useful.
There are some rough edges, though, and after testing it I think the concept is great but could still be refined in a future version.
For context, I tested it with an iPhone 12 Pro in a thin MagSafe-compatible case, an Apple Watch Series 10, and my AirPods Pro 2.
Build quality and design
This is probably the strongest part of the K1 Ultra.
The aluminum body feels extremely solid and much more premium than I expected from a power bank. The front and rear glass panels have a matte/frosted finish with a texture that actually reminds me a little of a MacBook trackpad.
And I really like this orange. It stands out without looking cheap, and the combination of orange aluminum and the frosted surfaces looks great in person.
The rotating mechanism is also strangely satisfying. There is a nice mechanical click when opening and closing it, and there is basically no looseness or wobble in the hinge.
The small kickstand deserves some credit too. It is tiny, but once opened it feels rock solid.
The magnets are strong as well. I never felt like my phone was about to accidentally slide off.
But this thing is THICK
This is probably the biggest compromise of choosing the 10,000mAh version.
The K1 Ultra is very thick. With it attached, I personally don’t find the phone particularly comfortable to use in my hand. It works, obviously, but this is not something I would leave attached while walking around and using my phone normally.
I see it more as a portable charging station that also happens to be a power bank. Attach it when you need power, put the phone down on a table, or open the stand and use it on a desk.
The thickness also creates a weird limitation with the kickstand. When the K1 Ultra is closed, the geometry doesn't really allow the phone to lean backwards enough, so the stand is much more useful once the power bank itself is opened.
If I were choosing again specifically for travel, I think I might actually go for the slimmer 5,000mAh version instead. I would lose some capacity, but the smaller size would probably fit my personal use better.
iPhone charging test
I wanted some actual numbers instead of just saying that it feels fast or feels slow. I tested the K1 Ultra against my normal wired charging setup and another wireless charger with active fan cooling, focusing mainly on 0–80%.
With my iPhone 12 Pro, wired charging took 62 minutes, active-cooled wireless charging took about 79 minutes, and the KUXIU K1 Ultra took 144 minutes to reach approximately 80%.
So there is no way around it: with my iPhone 12 Pro, the K1 Ultra is considerably slower. At 60 minutes it reached 40%, while wired charging reached 79% and the active-cooled charger reached 63%. At 120 minutes the KUXIU was at 71%.
This is an old iPhone 12 Pro, so it is not a test of the maximum charging speed the K1 Ultra is capable of with newer iPhones. My comparison wireless charger also has active cooling.
Heat was not a problem
Despite the long charging session, neither the phone nor the charger became annoyingly hot. The aluminum body probably helps with dissipating heat, and while charging isn't particularly fast on my old 12 Pro, thermals were completely acceptable.
Apple Watch charging
The original Apple Watch charger reached 100% in 66 minutes, a licensed third-party charger reached 99% in about 70 minutes, and the KUXIU reached 97% at 73 minutes. For something built directly into a battery pack, I'm completely fine with this.
Watch charging needs a button press on my unit
When I attach my iPhone, the K1 Ultra automatically wakes up and starts charging it. But when I put my Apple Watch on the Watch charger, nothing happens until I press the button on the power bank. Even if the iPhone is already charging, I still have to press the button.
A reader suggested trying a low-current mode. I have not independently verified that sequence on this exact 10,000mAh unit, so I am not presenting it as an established fix. My confirmed observation is that pressing the power-bank button started charging my Apple Watch Series 10. If your Watch does not start, check its charging indicator after pressing the button and use the instructions supplied with your exact version.
The LED is also not bedroom-friendly
When charging the Watch, the status LED on the front keeps flashing. During the day I don't care, but on a bedside table in a dark room I definitely do. I would prefer an option to turn it off, a much dimmer LED, or for it to switch off after briefly showing the status.
AirPods work too
My AirPods Pro 2 can also be charged from the K1 Ultra. Because my AirPods case supports charging from an Apple Watch charger as well, it magnetically attaches to either the main magnetic charging area or the smaller Watch charging area.
I wish the USB-C port were on the other side
When the K1 Ultra is being used as a stand while connected to USB-C power, the cable plugs into what becomes the top of the device. It works perfectly fine, but putting the port on the opposite edge would make cable management much cleaner.
What I like
- Excellent aluminum construction
- Frosted glass surfaces feel surprisingly premium
- Strong magnets and a very solid hinge
- Built-in Apple Watch charging is genuinely useful when traveling
- AirPods can be charged as well
- No uncomfortable overheating during my iPhone test
What I would change
- It's very thick
- Apple Watch charging should start automatically
- The Watch charging LED shouldn't continuously flash
- USB-C port placement is awkward when using it as a stand
- Wireless iPhone charging was quite slow with my iPhone 12 Pro
Final thoughts
I think the idea behind the K1 Ultra is excellent. Rather than carrying a MagSafe power bank, Apple Watch charger and travel stand separately, this combines all three into one extremely solid piece of hardware.
The biggest question is whether you are willing to accept the thickness. For me, the 10,000mAh K1 Ultra feels more like a portable 3-in-1 charging station than something I would permanently keep attached to my phone.
For a desk, hotel room, train, airport or anywhere else where I can put the phone down while charging, the design makes a lot of sense. If maximum portability were my priority, I'd probably choose the thinner 5,000mAh version next time.
There are a few details I hope KUXIU improves in the next generation: automatic Watch charging, the flashing LED, the ticking noise and the USB-C port placement. But the fundamental concept is very good.
