Never heard anything like that before. I used to work in the battery charger business, so I think I know a thing or two. If your battery is fully charged when you put the car away for the winter, and you disconnect it, then it should still be good in the Spring with no battery tender or...
I think this is your problem. . .possibly overcharging the batteries. If you charge them too much you build up heat and pressure inside that can damage them. The conditions you describe (sitting for up to 3 weeks) should not require any charging or battery tender at all. Your batteries (any...
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