I learned from @dlarc that my surprise new Astatic D104 microphone is powered by a 9 volt battery lol. I am happy to let this poor Rayovac retire at 3.6v. Do we think alkaline is the best chemistry here and not say a lithium ion rechargeable?
The attached picture is an excerpt from the AES Ham Radio Catalog Summer 1994 https://archive.org/details/aeshamradiocatal00unse_31/page/44/mode/2up