Videotest: cordless/rechargeable soldering iron 10 W TK-USB

Is it sensible to buy a tiny, battery-powered soldering iron? Can such a soldering iron cope with soldering wires or goldpins? I invite you to a video test - with a breakdown of lead and lead-free solder. I bought the soldering iron for £30 - importantly, you can also buy soldering tips for it.

There was a bit of a wait for shipping, but maybe it was worth it?

The product comes in different colours and there is also a version with LCD.

Instructions - there is also a section in English. Declared power is 10 W, charging voltage is 5 V. Supported arrowheads: TK-USB-K, TK-USB-C and TK-USB-B. A button allows you to select one of three temperatures, although it's probably about power selection in practice.

Time for testing:


I started by warming up. The soldering iron takes a good minute to warm up. It is not a tool for the impatient.

Then it came to testing the soldering. Each test is a separate video.

Soldering wires - full power - lead binder:

The result is quite good, it even went without extra flux, although it probably would have helped. Successful soldering.

Soldering the wires - full strength - lead free solder:

Pb-free binder has a higher melting point, but here too it went acceptably.

Soldering thicker wires - full strength - lead binder:

Here I added flux and it also went reasonably well, although the heating power was initially lacking.

Goldpins - full power - lead binder:

It worked out reasonably well, although it's not the same comfort as with more powerful soldering irons.

Goldpins - full power - lead-free binder:

Also managed to solder.

So is it so beautiful and you can throw the wired soldering iron into the corner?
Unfortunately there is no such option. For most applications, however, the heating power is lacking. The larger the component, the larger the copper spout, etc, the worse the soldering:

The binder even solidifies prematurely and "grabs" the soldering iron tip. There is simply a lack of heating power. The more copper, elements, layers, the stronger the heat escapes and is simply missing.

In summary , it may have been better than in my tests those 6 years ago when I tested the ZD-20E battery soldering iron, but I still wouldn't reach for this soldering iron for normal work. I'd definitely prefer to pull an extension cord, it's a better comfort to work with, heats up quicker and there's no risk of it discharging.
However, that doesn't change the fact that this soldering iron is indeed capable of connecting two wires, or thereabouts soldering simple goldpins into a small board where there is no large copper spout. This can be its advantage in unusual situations, when, for example, you are assembling something away from a socket and need to make one or two connections.
This is when you might consider buying it. I certainly don't recommend it for "lazy" people who don't want to pull out a larger soldering iron, because in the end they will lose more time wrestling with this gadget anyway than they will save thanks to its mobility.
This was just my opinion though - what do you think? What is such a soldering iron useful for?