Mark,
For "At Rest" - defined as zero electron flow in the battery - you are
correct.
http://www.wind-sun.com/PDF_Files/battvoltandsoc.pdf
gives a first class in-depth dissertation on Lead Acid batteries
I have read it several times... Especially as I run my Emergency Ham
transceivers, which are sensitive to input voltage, off of 12V
batteries.
But I still think that the Charge-Discharge graphs tend to support the
basic content of my email that one can see batteries going down to
less than 10V.
There are quite a number of "Battery Boosters" on the market that
compensate for the wide variance in voltage that one can get from car
batteries.
Personally, when I can afford it, I'm going to get an Optima battery...
It'll be the last battery I'll have to buy
Dave G.
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