Bests & Worsts Reviews from Amazon

I've used various brands of battery maintainers over the years including ones from Porsche, Black & Decker, Harbor Freight, etc. While I'm not an electronics expert, I do know how to properly use them. I purchased this model from Amazon after using a different model B&D maintainer with good luck for over a decade. This one was to replace a $6 Harbor Freight model that failed after the cord became frayed. It arrived quickly (thanks Prime) and I hooked it up the next day. Or at least tried to. Using the alligator clips I noticed the red LED came one (indicating the polarity was reversed or some other charging problem). Now, I've hooked these up 100's of times, but I double-checked anyhow, but it was hooked up correctly. I thought maybe it was the clips themselves, so I installed the wire extensions directly to the battery but had the exact same result. Lastly, I tried the included accessories adapter (cigarette lighter adapter) which is IMPOSSIBLE to hook up backwards, but same thing - red warning LED. For giggles, I purposely hooked it up one last time with the alligator clips installed backwards, thinking maybe this unit's internal wiring was backwards also - but nope, same issue. I then emailed the listed manufacturer (Baccus Global) to inquire whether or not the red LED was supposed to be on all the time on a fully charged battery as the manual doesn't address this issue at all. I went into detail the steps I had taken (as I recounted above) and the various methods of installation I had already tried. It took them THREE days to respond to the email, even though their manual clearly advertises 24 hour service via the website. And then, it was obvious they hadn't even bothered to fully read/understand my email as I simply got a canned reply saying "not to use other maintainer cords" (which I never did, nor said I did) and that the red LED indicates reverse polarity (duh) and that if I had any other questions to let them know. Needless to say, back to Amazon it went and writing this review as I pick out a different (non-B&D) model. If I could give less than one star to Baccus Global, I would.