Whatever battery you put in for charging, within five minutes it shows you a full indication.
Of course, it doesn't even charge.
Waste of money.
I don't even have the willingness to deal with its warranty.

Classic case of trying to make the charger "smart", but ultimately useless for what you actually need it for - charging a dead battery. One dead car battery wouldn't start charging and gave an error, while another one charged it up to 6V because it thought it was a 6V battery! Luckily, I had a Bosch charger from the 30s in the closet that charged both batteries perfectly and got the car going!

Money wasted.

I have it to charge and maintain 70A batteries, it has not given me any problem. I highly recommend it.