Hi,
I have a RS Boundary Mike (clone of Crown PZM) that I've used for many years. It uses a 357 coin battery. I replaced the battery, but the mike barely outputs anything. It has sat up for several years, so I replaced the battery but still almost nothing. It used to be so "hot" that I had to use an inline attenuator with my cassette recorder, for interviews.
I *think* this is an electret mike. Do they lose their charge over time, and can they they be re-charged?
TIA