Mine had some sort of captive (which didn't stay captive) brass thing in the plastic molding, I had to remove the whole battery tray (which may not be easy with the battery bolted to it).Hi all today i tried to remove the battery ,but the 13mm bolt is just turning that holds the plastic clamp to restrian it , i could not feel a nut on the other end have i missed something or is it a hacksaw job !
I know this is an old thread but I have just come across the same problem. How far down the battery tray is the captive nut ?