get some old copper wire (preferably old house power wire, with thick copper strands) and wrap around to make up some thickness.
failing that, some 1mm aluminium sheet (or 0.5mm wrapped around a few times).. sand the surface of the ally before using to reduce oxide thickness...
or failing all that.. a bunch of appropriately sized cut off chunks of nails
i guess... ideally... you would measure the difference in size, then get some wire with thickness half that, and wrap around the terminal (the one connected to the wire) and then clamp it onto the battery....
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