The Flextail Zero Might Be The Lightest 10,000mAh Charger We Have Tested

A 10,000mAh power bank that feels shockingly light sounds like marketing hype until you hold one. We take a close look at the Flextail Zero Power Bank, a carbon fiber ultralight charger that aims to beat the usual backpacking and travel staples on weight, size, and everyday convenience.

We start with the basics that matter when you are packing for hiking, camping, or airports: the Flextail Zero comes in around 145 grams (5.1 ounces), and that carbon fiber shell is designed to handle the knocks that happen in the real world. We also talk about the IPX4 rating, what “splash resistant” actually means, and why it is not the same as waterproof if you are planning wet-weather trips.

Then we get into the feature that genuinely changes how you pack: a built-in USB-C cord that stores right on the unit via a lanyard-style attachment. If you have ever reached for a battery bank and realized your cable is missing, this design is the simplest fix possible. We also test phone charging behavior, discuss the fast-charge handshake we see on connection, and break down the double-press modes that switch between regular power and a supercharged option. The spec claim of up to 22.5W fast charging comes up too, along with what we still want to test over longer runs.

We close by weighing the trade-offs: IPX4 limitations, the value of carbon fiber durability, airline-friendly UN38.3 compliance, and whether the roughly $53.99 price feels fair for an ultralight 10,000mAh power bank built for outdoor adventures and travel. If you are trying to build a lighter kit without giving up reliable charging, this one is worth a serious look. Subscribe for more gear reviews, share this with a hiking buddy, and leave a review with your go-to power bank pick.

Transcript

Why This Power Bank Matters

SPEAKER_00 0:00

Hey, welcome to the Natural Medic Adventures. I've been looking for one for a while that might be a contender to take the Nikor 10,000. That's been the king of the Ultralight Power Banks for years, but this one is made out of carbon fibers or Flextail. It might just take the crayon. And it might be a few bucks less than that. So let's take a look and see how it compares. I want to talk to you today about the Flextail Zero Power Bank. I've been searching for a good product that meets all my requirements for backpacking and travel. And I think this one might fit the bill.

Weight And Carbon Fiber Build

SPEAKER_00 0:42

Let's look at the specs on the outside here. First off, this is very lightweight. It's made of carbon fiber. We'll take it out in a second look at it. But according to the package here, it is 145 grams or 5.1 ounces. And just holding this in my hand, quite possibly the lightest 10,000 power bank I've ever held in my hand. Let's open it up and see what we got inside.

Unboxing And Port Layout

SPEAKER_00 1:04

Yeah, this is very small. Look how small that is. So it's all wrapped up. Pre-imprimage packaging. First off, I love the design on there. You can see that very clear on camera. But it's kind of like a chickard type design. On the top two ports there. One for charging, one for recharging the device, and a power button. Alright, pretty simple ergonomics. Because it's carbon fiber, it is IPX4. It's resistant because of the durability of the case to drops and things like that. Makes it ideal for outdoor adventures, travel, etc. I'm assuming there's some kind of cord that comes with it. And here it is. So you can run this little cord through the corner here. It has a little spot for you to attach this on there. But the cool thing about this is that once you hit the button and open it, there we go, you have voila, a cord. A lot of times I lose my cord. And so it's nice to have this handy attached to a lanyard. I haven't attached it yet, but pretty easy to do. Alright, I fixed it. So now you have a cord attached

Built In Cord And Charging Modes

SPEAKER_00 2:30

via lanyard to your device to charge it. Let's turn it on and see how it works. We have some lights indicating that it's on. And this, I'm sure, indicates how much charge it has. It's fully charged. Let's just plug it into my phone right here, which is in need of a charge. And we'll see how that does. Unplug it, plug it back in. My particular phone, your phone may vary, but with my particular phone, I plugged it in and it said turbo power. Whenever I plugged it in. So what you'll see on this guy, right on the right side right there, when I double press it, it changes to green. So that puts it in regular power mode. Then when you double-click it, it puts it in supercharged mode. You get about 20% more power than you would under a normal circumstance. Now I've not used this to charge my phone from nothing to full charge. So I can't tell you how long that takes. I can't tell you how many charges you can get out of this thing. But according to what it says on the site, it will deliver 22.5 watts to quickly charge your devices, which outperforms many other devices out there.

Durability Airline Approval And Limits

SPEAKER_00 3:57

I already mentioned the carbon fiber durability. So that's going to not only provide drop protection, it's also going to make it where it's capable to be used at 10 degrees Celsius, which is below freezing. So it makes it an ideal charger for the cable that you need. Or the device that you need. And because of its small size, it is certified UN383, which means it's airline approved. You can take it on an aircraft. But I'll tell you what I like about it. I do like that the cord is handily available. Put it in here, and you have a cord that can charge your phone from the device port, which is the orange one. And then it can be recharged from the other port using the same cord. That's a USB-C cord, and I can't believe how lightweight this is. So there's a lot of other ones out there that are similar in comparison, but I think this one is a good one to pick up if you're in the need of a good outdoor or travel-related or both power bank to take with you on your adventures outdoors.

Price Trade Offs And Final Verdict

SPEAKER_00 5:16

So, of course, a couple of trade-offs. This is IPX4, which means it's splash resistant. You cannot immerse it in the water. But is it light enough to justify that $53.99 of this recording price tag? Let me know what your thoughts are about this lightweight, nifty little power bank that could be a good contender to replace the lovely old Nykor.