On Jan 11, 10:43 pm, wrote:
On Jan 11, 6:49 pm, "Michael J. Coslo" wrote:

What manner of batteries did they use? I'm imagining salt water
batteries, but not sure.

I'm not sure what you mean by "salt water batteries", Mike.

A battery using salt water as an electrolyte. One version is a
"Volta's pile".

They usually had discs of copper and zinc separated by paper soaked in
electrolyte. 1 volt per cell in that construction. I don't know the
current per cell.

Typical laboratory use had stacks in a glass tube, but that wouldn't
be strong enough for use on the ocean.