Had a out-side the box thought after seeing so much discussion about re-charging batteries for GPS.CPAP and other electronics.

I know we have some engineers/ electronic guys here, so here's what I'm thinking :-?

What would it take to modify a clamp- on type transducer to power a battery charger?  I'm thinking some kind of paddle wheel on the transducer end. I know they have those hand crank devices to re-charge cell phones, maybe an adaption of that technology would work?

Your paddling anyhow, so why not let your effort charge your batteries?
I'm sure there are obstacles that I haven't considered, but that's why we have the brain trusts on the QJ ;D

I have NO clue about how to go about it, but I bet someone here does ;)