Now that I'm not using my tractor to mow my lawn I'm finding that the battery can run down to where it doesn't want to start after several weeks. I'd previously noted this in the winter but had figured it was the cold weather. Apparently there's something on there that puts a little draw on the relatively small battery (what I don't know--I'll have to ask my dealer about that one.) Previously the local battery shop had recommended that I get a Battery Tender Jr. for our Kawasaki mule which usually sits unused much of the winter but I never got around to it. I'm thinking one for each could be a good idea as well as for my zero turn which obviously won't see any winter use at all. Are these things as advertised? A gimmick? Actually bad for batteries?

I looked and they sell multi-output systems. I can buy 3 Jr's and a power strip for less!