I believe someone on this forum had issues with NOCO. Don't recall what they were.Me too, which is why I was trying to point out (perhaps not clearly enough) that you can get a good NOCO charger for about the same as the Chinese ones, if you look around.
"Designed and engineered in the USA. Over 100 years of American ingenuity and vision." They're a US company, though I'm sure at least parts of their stuff are manufactured in China (like everything electronic). https://no.co/about-us
If the battery is truly dead, no fancy charger is going to help that. If it has a dead cell, no fancy charger is going to help. There are a lot of problems it won't help. But if your battery has some mild sulfation problems and stuff, they can help reverse those, and then keep it maintained going forward.
The small NOCO chargers do just fine, they're just lower amperage (for the most part... there are some feature differences). For example, I use a little NOCO charger to tend my tractor battery over the winter, because it sits for 5-6 months getting below freezing every night. In 13 years since I bought the tractor new, I've only replaced the battery once, maybe 4 years ago. As I posted earlier, the batteries my LMTV came with lasted ~5 more years, by charging and maintaining with the NOCO Gen4.
The NOCO chargers are designed to be left plugged in. They automatically monitor the battery, charge when needed, desulfate when needed, etc., so that they keep the battery as maintained as possible.
I can't say other brands of "smart chargers" wouldn't work as good, but I'm definitely satisfied with NOCO.