Everything is fine, I opened it, put the battery to charge, the strange thing it does is that when the battery is full, it doesn't stay steady at the full indication, it starts charging again and then goes back to full. I don't bother going through the process of returning it, it's not worth the trouble for the amount it costs. I don't have high expectations anyway, but if someone has a similar issue, they can mention it in a comment.

I bought it because I forgot to turn off the motorcycle switch all night and the battery died. I put it on slow charge 2A 12V and the battery fully recovered in about 3 hours. If the battery is completely discharged, no charger will bring it back

The construction could be better than plastic, etc., but okay. I bought it last minute before leaving for a 2-month business trip. When I returned, it was showing full on the screen and indeed the car took off smoothly! So far, so good.

I bought 2 for 23 euros each last May and permanently installed them on my boat in 2 batteries of 105 ampere marine exactly because they charge with 4 Ah for slow charging and they work perfectly until now.

I bought one due to the lack of vehicle movement because of the coronavirus lockdown. I tested it by charging a 60 A battery and had no issues. The next purchase I made was another one of the same kind for general maintenance of the batteries of these vehicles as well as a Piaggio scooter with an 11 A Gel battery technology.

I followed the instructions for use. The problem is that the charger does not follow them! Maybe the battery is also to blame, as it was quite discharged. The issue is that the charger does not work properly and its indications are all over the place. I connect the cables to the battery, positive first and then negative, and then I connect the charger to the power. Instead of showing an indication that the battery is charging, it flashes the Error sign and an indication that the volts are increasing. They increase at a turtle's pace, for example, I left the battery charging for a whole day and the volts increased by 1! And as I think about how all of this cost me 30€ and a week of waiting for the charger to arrive, because it was out of stock, it is truly disappointing! Get something else!