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I didn't realise the box was now USB C. It used to be a barrel jack hence that cable.
It won't work in reverse but loads of the more powerful USB C PD power banks have 12v but it might not be explicit in the description.
This one for instance https://www.amazon.co.uk/Baseus-Portable-20000mAh-Charging-External/dp/B0BF5HNQNV/
You can see it on the image
Same with this one
https://amzn.eu/d/1hscGpp
aggi
inchpincher
Thanks all, I've been trawling the thread for tips from @HatBeard & @Gewürzt experiments. The Thermoworks gear is on special offer as a bundle at the moment so finally pulled the trigger. Nearly forgot to order the Kamado adaptor but a speedy follow up email came to the rescue.
@aggi Dumb question but does that cable work in reverse because I can find loads of power banks with a 12V barrel output (the Signal control box is USB-C input)? Can't find many battery packs with 12V USB output.