RE: [CAD_CAM_EDM_DRO] 1.5 volts

I don't know the chemistry, but 1.5 is not an exclusive value by any means.
From what I know the nominal volts per cell will change for the chemistry.
Zinc-carbon - 1.5
Lead-acid - 2
Ni-Cod - 1.2
Lithium - 3
And I am sure there are many more. Seems to me that the battery companies
try to create new battery chemistries in consumer cells that will be
backward compatible to the original standard 1.5 of a zinc-carbon cell.
Lithium primary cells are an example. There are not nominal 1.5 volt
versions, but the original lithium cells are all 3 volts.

Tim
[Denver, CO]

> Curiously, I was doing some reading on Batteries. Of course
> all you old timers and electronics guys know that a "Battery" has
> to be more than 1.5 volts. A battery by definition is composed
> of 2 or more "cells" (1.5 volts each). So any combination of
> Nickel, Zinc, Copper, etc. and whatever electolyte will give the
> same potential difference. With a few exceptions (Like Lithium is
> 1.3V or something like that)
> What I want to know is WHY a chemical battery always produces
> approximately 1.5 volts? A quick and dirty chemistry lesson is
> all I want, so I can impress my co-workers.