Technoline does not deal with chargers. This specific one is one of the old top models of La Crosse Technology, one of the best companies in this field, which has been introduced to Europe by the German company, with a slightly different name. It does what its specifications say (independent circuits, trickle charge, etc.) and works reliably for many years. It operates with an external, provided power supply.
However, it does not recognize batteries that have dropped below a certain voltage due to deep discharge. In that case, another charger is needed to provide the initial current.
As disadvantages, I would also mention the small, hard-to-read screen and the fact that the information is provided one by one by pressing the button.

It charges only AA and AAA batteries, but it is the best for this job.
From the screen, you have a picture of how much energy the battery has stored, and if you see that the performance has dropped, it has a function that can restore it for you. It restored batteries that I had for disposal to 80% of their original capacity!
I have replaced almost all the batteries in the house with rechargeable ones now, and this charger is an essential tool to ensure that the investment will pay off, as the batteries will be preserved for the promised charges.

One of the best chargers on the market. It can charge 1 battery on its own or 2, 3, 4 batteries, while other chargers can only charge 2 or 4. It can simultaneously charge, discharge, and test 2, 3, 4 AA and AAA batteries. The only thing missing is the battery level indicator. Check out its functionality on YouTube and you will understand. https://www.youtube.com/watch?v=vuWmJWIOfks.

I bought this specific charger about 2 months ago and I just wanted to test it well before writing. If you are looking for a good and affordable charger for your expensive rechargeable batteries...stop searching...you found it!

The charger is simply amazing, it revived even the dead batteries that I was planning to recycle. The only requirement is that you have the willingness to read the manual to understand how it works.

If I had to write something negative...it's that it's not easy to remove the two middle batteries when you have all four inserted...it doesn't have a hole like other chargers, but these are minor details. :)