On Fri, 11 Jun 2010 06:37:36 -0700, "John Gardner" said:
> Thanks for correcting my error, Mike. The battery I'm
> talking about is indeed AGM, not a GEL cell.
> 
> Optima AGM datasheets claim an internal impedance of
> 2 milliohms.
> 
> Datasheets of  flooded-cell batteries with similar AH ratings
> claim Z = 10 milliohm. Quite a difference.
> 
> Quite a diffference in price, too, it should be said :)  Horses
> for courses...
> 

I have a non-Optima AGM battery in my car:
http://www.batterymart.com/p-12v-mazda-miata-battery.html

Just a gut feeling but I don't think it has as low an impedance as a wet
battery. When I bought the car it had a regular battery in it and it
seemed to crank faster than with the AGM.

So maybe the Optima "fruit roll" process is superior to how mine is
constructed.

Cheerful regards,

Bob

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