I also bought seven of that same battery. They are very heavy at 100 lbs each with no handles. I'm not sure what I will do with the seventh one, but I got a better price for the lot than just buying six.
I never got around to installing them for this summer's trips, but I did get the cables for them. They will be installed before I head out again next year. I would like to hear how they work out for you.
My golf cart battery terminals are corroding like crazy, but the water level has been good every time I check them.