Actually the tool you referenced is a plumbing wrench, an adjustable like a
crescent, but made for low strength plumbing connections.

The battery clamp puller is the top left in this photo, made for the old
top post batteries.

https://kirkhmb.smugmug.com/Woodworking/Tools/Carter-Tools/i-vs6x7hT

The cone shaped adjuster closes the jaws around the clamp, the smaller bar
drives a second screw down into the post, pulling the clamp up.

Here is a better image of what it looks like

https://www.amazon.com/CARTMAN-Battery-Terminal-Bearing-Remover/dp/B07TYLZXPK

Kirk in Half Moon Bay, CA

On Sat, Feb 25, 2023 at 3:34 AM Julian Hardstone 
wrote:

> .
>
> A quick question, about that adjustable spanner thing, bottom right in the
> photo "51# of heavy tools, chisels, punches, files etc, and a block of
> lead" - is that the battery clamp puller you mention in photo "Bottom layer
> of the 51# box..." ?
>
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Sent from my iPad, apologies for the Auto Correct errors. Kirk


-- 
Kirk Eppler in Half Moon Bay, CA