I have 6 or so Sears 2 Amp units, just bought another yesterday. They auto-select between 6 and 12 Volts.
They've worked well for me.
Also, I try to remember to disconnect the batteries on anything that sits unused for over a few days or weeks, have a number of them set up with battery disconnect switch, making that easy.
You would find it surprising how much that helps, even without a battery maintainer they typically hold charge a lot better and last a LOT longer.
Almost everything has a least a little electrical leakage to ground, whether it be a newer vehicle with computers that "sleep" but don't shut off completely, or simply have an alternator, or even some (possibly hidden) dirty/rusted/corroded electrical components.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
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