Requesting help with battery module swap.

hi there, how bad is this & what can I do about it?(see attachmentplease), I'm currently doing bandaid repair by swapping module #4 with a presumably ok one I just bought, currently de-rusting link plates & attaching nuts on salt & vinegar, but I'm clueless as to what to do with those ring terminal crimps & heavy gauge cable crimps, any help much appreciated & thanks in advance