It fully charges the weakened battery (due to infrequent use of a parked car) completely.

I bought it to charge the battery in my father's 2006 Civic, which had completely discharged due to inactivity. Nothing was turning on. When I connected it, it seemed to not recognize the Civic's battery at all (because it was completely dead), so I needed to connect my car's battery at the same time. Then it recognized it and started charging the dead Civic battery normally. Therefore, it worked perfectly for the reason I bought it.

I bought it to charge a discharged car battery, Varta C22 12V 52Ah 470A.
The battery hadn't completely reached 0, but it didn't have enough voltage to start the vehicle. I brought it up to the apartment and let it charge all night and everything was fine. Since then, I have charged 3 other batteries with the same good results.
I am not knowledgeable at all about these matters, and the fact that this machine is so simple and easy to use says a lot about me being able to do my job. The indicator lights are (I believe) self-explanatory, and the process is not difficult unless you consider taking the battery out of the car and bringing it home to be a hassle.

It is for small batteries up to 50-60ah, but if you use it on a larger one, it will take a long time to charge it, but it will do it. The indicators on top are okay. It is completely silent and as I use it, it does not heat up, only under normal conditions.

The device operates by connecting to a power outlet, so for someone who doesn't have a private garage with electricity, it is not useful at all.
In the end, what I probably needed was a battery starter

It was purchased for a 52Ah battery (small-medium car), which was not empty but discharged to the point where the car couldn't start. The charger was connected for about 10 hours and failed to charge it to a point where the car could start. The charger is 2A, for a motorcycle battery it may be satisfactory or if it is connected to a car for maintenance for a month, but for quick use, no way.

Excellent product, on a varadero 1000 motorcycle battery, it fully charges in 3 hours, it connected easily, I pressed the starter, and it started immediately. I think for motorcycles, nothing else is needed.

Good purchase. I was saved from constant battery discharges now that the car stays in the garage for a long time due to quarantine. Initially, it charged my almost empty battery and now it always keeps it charged. I don't think I need something bigger and more expensive for this use. It is a quite quality construction.

Very good for its price. It charges car battery easily and quickly. It doesn't need anything more expensive.