.
Do not buy this cable. It disconnects easily.
The connection part is “clicked” and looks solid,
In reality, the battery is not charged, and even though it has been connected for a long time, it is often not charged at all.

I wanted an unobtrusive cable length for outside use.

Bought a 2-pack, used twice on the road, both cables stopped charging halfway through.

Why did it malfunction?

Not sure, but it seems that the inside of the cable breaks as soon as it is bent and used.
I had been using this cable to connect my phone to the battery and moving it around in my pocket, and that seems to be the cause of the breakage.
The annoying part is that depending on how you bend it, it can charge the battery so you don’t notice it until it’s too late.

Purchased → confirmed that it can be charged → used on the go → disconnected
It is already past the return period and cannot be returned.

What about a more durable cable?

The following has been in use for 10 months with no problems.

[USB Type C cable [2m/2 sets] Type C cable 3A fast charging fast data transfer high durability nylon braided USB-A to USB-C cable Xiaomi Redmi 9T, Sony Xperia XZ3 XZ2 XZs, Galaxy S21 S10+ S9 S8, Note 10 9, Oppo reno, HUAWEI and other Android USB-C devices compatible (Type C Cable PD)](https://www.amazon.co.jp/gp/product/B09XRJHWWC/ref=ppx_yo_dt_b_search_asin_title? ie=UTF8&psc=1)

But the length is 2m, which is too long for use on the move.

Is it ok if it’s from the same manufacturer?

The manufacturer is listed as “T2K”, but reviews of other T2K cables also say that they broke immediately,
It seems that it is not always reliable.