Hi. I spoke with an electrical engineer, and was told that the battery will likely drain faster with speech going thru the speaker, rather than headphones. There is likely a stage of amplification beyond where the headphone connection is, and this would, of course, use power. Surprisingly, I was told that the speech volume had little to do with battery drain. So, apparently, it's ok to turn the "talking until battery goes flat" message way down.

Aloha,
doug


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