I had some reference photos of the '77 car (Lotus 78) and it showed the battery having two "normal" terminals you'd see on your everyday car. It even used one red and one black cable. I used a banjo fitting to simulate the connection and it worked well.
My $0.02. Let me know and I'll send what pics I have to ya of the 78 that shows this (if I still have them...
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Daniel