I'll step in with my 2 cents.

I agree with Billy. In my view, the design would be to run on batteries unless external 5 volt power was available, and it would automatically switch to use the external power as required.

No manufacturer would expect you to remove the batteries before you could connect to external power. Moreover, if that was a requirement, there would be an interlock of some description so that the external plug could not connect while the batteries were inserted.

I'm very confident that they can both coexist.


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