I used it once and everything was perfect, the next time for no reason it started burning resistors consecutively and ended up in service, we'll see...

Purchase date 17/10/2021. It charges motorcycle batteries (10-12 AH) and car batteries (40-50 AH) perfectly in 4 amps with a charging time of 5 to 10 hours depending on the battery. It also has a 9-amp option for faster charging, which I did not use because I was told that a lower amp provides better charging even if it takes more time. The device gets quite warm, but it did not cause any issues (it has ventilation grilles). I also have a digital charger that does not charge as well because it cuts off the charging early before reaching full charge, probably due to a safety circuit to prevent overcharging. The TOTAL charger also has overcharge protection, and I have never had any overcharging issues with it, even when I left the battery charging for more than 12 to 15 hours on some occasions.