As Joe said, jump starters will run the things for a while with the high capacity things being the exception but for the dollars they cost you can get a nice portable power station such as Bluetti and numerous other companies sell (that's the name I know but there are lots of them). You get a dedicated supply which will run so much more than just the mount and not a great deal dearer than a good jump starter and probably lighter too using the LiFePo4 batteries.
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