I have 2 hotrods, a small tractor, 2 lawn mowers, and a small self powered bush hog that all have batteries and won't be started until spring. So I have 6 batteries sitting on a bench. I just had to buy 3 batteries and I'm tired of buying batteries. I don't want to buy six battery maintainers either. I have a Battery Tender Plus. I am wondering if all those batteries could be hooked together and charged from one Battery Tender instead of changing the charger from battery to battery all winter long. I'm kind of electrically challenged, but something tells me you can't do that. What do you think?