Should all the interconnect wires be the same length or should longer ones be twice as thick to make sure they do not add resistance in series? These are either going to fit in a square or two over, two under on a vented shelf with all precautions against shorts, etc. These batteries were well maintained and used in a cleaning machine since 2017. They are out of service because the new cleaning machine takes a different battery type. All voltages measured good. I paid €75 each. New cost is €469 each. Before this my choices were solar deep cycle 12v 55ah for €76 each x 4 or 12v 100ah EFB for €73 each x 4. I was not happy with either option. I just got very lucky. I rented a car and drove six hours round-trip to get these. They are quality and suited for the task. I'll provide an update when they are installed and working or not, but I cannot imagine why they would not work.