![]() I don't believe this particular unit will detect that it's fully charged for at least several minutes. So the thing turns on, all three lights cycle, and the yellow light stays on if it's connected to a battery, or all the lights turn off and stay off if they're not. There's a 1.5A onboard version that only has two lights, but it could be easy to control that function by hardwiring. Maybe the 3A version uses a bigger power supply. They have a variety of different 1.5A and 3A maintainers, and I'd think they probably use the same guts to some degree. It's probably a switched-mode power supply inside, and there's no vent holes. My box is really light and probably doesn't have a heavy transformer to operate a linear power supply with heavy coils like the old one. Again, I think they're probably the same under the hood, but where the case and the light positions are different. I saw the XM1-5 for sale at a Wal-Mart store though for just under $20. I've seen it for $17 from Amazon and online only from Wal-Mart. Just wanted to update my experience with the Schumacher SEM-1562A-CA. The one I got looks more like the lower photo. Schumacher also seems to change up the box a lot. It wouldn't surprise me if they weren't using the exact same electronics inside, but with a different box. It does seem to come in a rectangular box though. It's got a 1.5A rating, three lights, clamps, and screw on connectors. I'm also under the impression that the unit that's the subject of this thread is functionally identical to the SEM-1562-CA that Wal-Mart currently has for $17. The older versions seem to have manual switches and less complicated electronics. ![]() Mine went kaput after a year or so, but when I figured out what was wrong it turned out to be a fairly simple circuit with some "smarts" provided by a handful of transistors and a voltage reference, no microprocessor involved. Must have a different design now since it says "microprocessor based", which mine certainly isn't. I have a 10 year old version of one of these I maintain my camper battery and MG's battery with in winter, and it works fine.
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