Back in the 80's, my cousin had a battery recycling business. He'd pick them up from stores, clean them up, put them on some kind of battery restoring machine, and resell them as recycles. There was a good demand for them. He made some decent money but it about destroyed his back. Carrying those heavy things 100 times a day, every day, was pretty hard on the body.
We replaced the batteries in an old 4 wheel drive tractor today. We have two of these old Versatiles and this is probably the +5th time I remember swapping out the batteries.
The batteries are up behind the cab but it's not too bad if you have a flat bed pickup. Just back up to the rear tires and heave ho.
They are heavy items, got curious and looked, 132lbs apiece. The parts store boys each took a side but I'm so manly I do it by myself.