I had bought the charger for 63€ back then for the agricultural vehicle that is in a remote area, recommended by an electronics store. Initially, I was disappointed because it didn't have an LCD screen and I couldn't understand what it does. So I left it aside and bought another one from a well-known department store which I was satisfied with. However, once the car had been idle for 4 months, it had no voltage, no indicator lights, nothing at all. I measured the battery with a multimeter and it showed 2.1V. The charger from the department store indicated a damaged battery and that was it. I dug up this one here, which was working properly. After 20 hours, it went into float mode. The battery fully recovered! And it has been functioning properly since then. You connect it and it does everything on its own.