Power banks that don't require carrying a cable: Comparing 3 solutions
Introduction
I've brought a power bank with me, but forgot the cable. I don't know how many times I've done that. All that's left in my hand is just a heavy lump.
It started when I saw a review for a carabiner-style power bank. You can hook it onto your bag to carry it around, and it even has a built-in cable. I thought it was an interesting design, and as I looked into it, I realized there are several ways to solve the problem of "not carrying a cable."
I haven't bought any of these yet. Below, I will compare them based on each company's official specifications. The figures are as of August 4, 2026.
Three ways to avoid carrying a cable
There are three main types.
Direct-plug type: A USB-C connector sticks directly out of the unit. The concept of a cable doesn't exist in the first place
Retractable built-in type: The cable is stored in the unit using a retractable mechanism, and you pull out only the length you need
Cable-integrated type: A short cable is attached to the unit, either fixed or detachable
Let me list some representative examples. The direct-plug type is the Anker Nano Power Bank (22.5W). It is 5,000mAh, weighs about 102g, and costs 3,490 yen. The retractable type is the same Anker's Nano Power Bank (45W), which is 10,000mAh, about 230g, and 6,990 yen. The cable can be adjusted in 8 stages from 7cm to 70cm.
The cable-integrated type is the CIO SMARTCOBY Pro SLIM CABLE. It is 10,000mAh, max 35W, weighs about 189g, and costs 5,980 yen. The built-in cable is short at about 21cm, but the fact that it is detachable and replaceable is a plus. Since the scariest thing about a cable-integrated type is wire breakage, it's worth checking whether it's designed to be repairable.
It's faster to look at the photos on the product pages for the thickness and how the cable is stored.
How do they compare in terms of weight?
Since the capacities and prices vary, I rearranged them by how many mAh they can carry per 1g.
CIO SMARTCOBY Pro SLIM CABLE: approx. 53mAh
Anker Nano (Direct-plug, 5,000mAh): approx. 49mAh
Anker Nano (Retractable, 10,000mAh): approx. 43mAh
The retractable mechanism adds weight because of the rollers and springs. This is the trade-off for the convenience of being able to extend it up to 70cm.
Here, I return to the carabiner type I mentioned at the beginning. The MaGdget Carabiner Battery is 5,000mAh, weighs about 180g, and provides about 28mAh per 1g. Since CIO carries 10,000mAh in 189g, it weighs almost the same despite having half the capacity.
However, this does not mean the performance is low. It weighs 180g as a result of packing in a carabiner, a 100-lumen LED light, and an Apple Watch charging function. All of that is included.
Pros and cons visible from specs and public information
Pros
The most helpful thing is that you cannot forget it. As long as the cable is attached to the main unit, you have the cable the moment you pick up the battery. It sounds obvious, but this makes a subtle difference.
Since you plug and unplug less often, the strain on the port is reduced. It is quite annoying when a device you use every day stops charging due to a poor connection.
Also, one item disappears from your pouch. If you go with the carabiner type, you can effectively eliminate the need for a separate light and Apple Watch charger as well.
Cons
What concerns me is wire breakage. If the built-in cable snaps, the entire unit might reach the end of its life. In that regard, models like the CIO, where you can replace just the cable, avoid this issue.
Another point is that you cannot choose the cable length. The 21cm cable on the CIO is fine for a desk, but it is too short if you are sitting away from an outlet. The fact that the Anker retractable cable extends up to 70cm is a clear advantage in this respect.
Check out the Anker Nano Power Bank (retractable cable)
Who is it recommended for?
It is suitable for the following people:
Those who want to reduce their luggage by even one gram (direct-plug type, approx. 102g)
Those who want both capacity and a cable-less design (CIO, approx. 189g for 10,000mAh)
Those who want flexibility in cable length (Anker retractable type)
Those who want to combine a light and Apple Watch charging as well (carabiner type)
Conversely, it is not suitable for those who want to fast-charge multiple devices at the same time. It is also not for those who are strictly aiming for the lightest weight possible. If you are willing to compromise on the cable, there are plenty of 5,000mAh models that weigh under 100g.
Summary
Not carrying cables. Even with the same goal, the form changes depending on what you decide to cut. If you prioritize lightness, the direct-plug type is the most straightforward choice. If you also want capacity, go for the cable-integrated type; if you often sit away from outlets, the retractable type is best. I think it is good to narrow it down in that order.
The carabiner type is relatively expensive if viewed just as a power bank. However, if you can stop carrying a separate light and Watch charger, the story changes. Whether you see it as just a battery or as a replacement for three items, I think it is a product that leaves a completely different impression.
Note that the MaGdget carabiner battery is a product from crowdfunding and is not currently available for general sale on Amazon. These are the two you can buy right now.
See CIO SMARTCOBY Pro SLIM CABLE
See Anker Nano Power Bank (Direct Plug-in)
I have written about charging on the go in other articles as well. If anything catches your eye, please take a look.
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