I have always had good luck with battery tender brand. I have 3 porsches, a truck, tractor and 2 atvs and I keep one on all of them. I have a 4 station battery tender mounted in the garage with leads hanging from the ceiling and when I pull in I automatically plug into it. These cars have a lot of drain on the electrical system when they sit idle and the tricle charger really prolongs the life of the battery. My tractor battery is over 10 years old and still going strong.
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