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Those might be the original batteries it shipped with... I'd put them in a plastic container and keep them with the set.
Getting a better look at the connector on the side of the set it looks like Panasonic tried to make the connector proprietary... it looks like that plastic lip recesses such that the plug can't fully seat against the metal ring of the connector like it needs to inorder to make proper contact....also there appears to be a switch built into the top of the lip that would engage with a plastic connector that matches the inner profile of the lip. That switch probably switches between the internal ant and the jack...it may be hard to keep the set unmodified and use a non-original adapter. If you don't mind hacking the set you could probably grind the lip down with the dremmel and shim the switch up.
Here is a goofy trick you can use for sets that don't have an external ant jack. Radio Shack sells these small leads with alligator clips on each end. When I needed to test my Philco Safari I just took a clip lead and grabbed the antenna with one end and the center pin of the coax with the other.
If you have multiple portable sets and want to run many at once and not be tethered you could get an agile modulator and rig up a low power transmitter that covers just your property. I got a Blonder Tongue AM60 a few years ago and no longer tether my sets directly to signal sources. There's plenty of discussion of this here on VK if you run a search.
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