We don't have a tube thingy on our batteries but most of what you describe seems normal as I can relate to what you've posted. I will sometimes notice a slight acid smell and sometimes will hear gurgling. I just now asked my husband what he would do as far as filling etc. He said his policy is ..once a week, in the morning after the cart has been plugged in all night he would unplug & then do the water ...never completely filling to the top of battery. He fills to the O ring that is located in the battery just below the opening. He says never to fill all the way to the top. You don't need to constantly be filling if that is what you;ve been doing. Our cart is used everyday, of course some days more distance than others, and plugged in every night and left plugged in all night. Hope our routine answers some of your concern. Has anyone in your area helped you out with this? I'll send you a pm with our # should you want to call us.
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