Not there to see it but, my guess is a worn out (or corroded contact(s) or etc) with the dpdt (been a while since I use the terms and may be off on it) switch used to change from rolloff to flat. A dpdt (double pole - double throw) is a kind of "double switch" that turns one side off while turning the other side on so, you got multiple contacts in there. You can check it out with a VOM and with a soldering gun and a few minor tools you can change it out.
BTW-are you referring to a battery box for the Core Sound Stealth Mics?
I have an extra from accidently tossing the dammed mics into the trash!!! (bad move but...lol)
also another potential problem with those things are in having the mic plugin to the battery box loosen up, it has wasted a recording with total sound cutoffs and very loud "pops"
....let me know....
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