if the site gives the RC rating you can come close to the Ah rating
RC is the number of minutes battery will sustain a discharge load of 25
amps to a cut-off voltage of 1.75 volts per cell (10.5V on 12V battery).
jimt
westydriver
aurora
On Monday, Sep 23, 2002, at 07:03 America/Denver, Joachim Preiss wrote:

> The web site doesn't tell me what Amp Hours the units have which I
> am used to, only the Cold Cranking Amps, and they are 540 vs. 650.