Updated 8th 2026
I am making a summary after 3.5 years of use (that’s how long it lasted):
1. The battery was bought in March 2023 and, from the codes written on it, the manufacturing date is the 9th week of 2023, so super "fresh"
2. After 1 month the top stickers came completely unstuck, revealing the 6 caps, I asked the dealership and the answer was "it doesn’t matter, it works properly"
3. In November 2024 liquid started coming out of one cap, which caused surface corrosion on the negative terminal. I called the dealership and the answer was "it’s probably from the load, it works properly, if you want send it in for inspection." I sent it, it was checked and they found "everything is fine". The caps were secured, the sticker that had come off was put back on, and the battery was returned to me.
The car has been checked on the dynamometer etc. and it is fine.
4. It lasted exactly 3.5 years, not 5, not 7, not... 10 as I see in some comments. Given the purchase cost, a disappointing lifespan.
Comparable, perhaps even longer, lifespan had similar Bosch S4 and Varta batteries with a clearly better purchase price.
First photo one month after purchase (stickers bye bye)... second photo a few days ago (leak from cap and terminal corrosion) ...
I will rate the whole experience 1 out of 5.

The first one I bought lasted me 5 years with little use (1-2 times a week and short distances). The second one lasted me 3 because the power broke and it was overcharged, resulting in boiling. I consider it a very high-quality battery, just a little expensive.

It was installed in a Renault Clio 5 years ago and still works like the first day.... I also put it in the charger - maintainer and it was at 79%

I have it in a 2004 Toyota Corolla.
I installed it in March 2015 and it still holds up today (March 2021), meaning 6 years.
It was recommended to me by the workshop.

I have it in my Ford Focus for 6 years and it still works! There is no reason for discussion.... The previous one was a Bosch, lasted for five years.... And more expensive, costing 90€..... Banner again, Banner!

Purchased today for a first-generation Ford Focus 1.6, the car now has a Bosch s 4 44Amp battery and has lasted for five years. I am changing it for preventive reasons because it is giving me trouble with starting. I went to a well-known store today with years of experience in the field, and they recommended this specific Branner 44Amp battery. They convinced me to buy it because it states a starting power of 420 A (EN), and when they measured it in front of me, it showed much more, specifically 468A starting power. Additionally, I have read very positive comments about it here. It is of Austrian manufacture, which is why I believe it is a bit expensive. But if it is indeed true that it is highly regarded and valued by those who have it, then the slightly higher price from this company is worth it. Time will tell.

7.5 years in a 2008 Focus 1.6 with 44 Ah (420 A) and it still goes. What else can you say. It's worth every last cent.
Finally, I replaced it on 10-12-21, just before its 8th birthday, without letting me down, but it was on its limits. Of course, it was replaced only with the same one. It really can't be compared!