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...

best regards, Jack
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