Good simple explanation Doug.
Let me just throw this out there since we're talking basics... a lot of smaller batteries will list AH but don't show CCA's. Mostly because they're for applications that don't use a starter and therefor have no need of a CCA rating. All is not lost.... there's a rule of thumb for that.
AH times 7.25 give you CCA. For instance, a battery listed as 10 amp/hrs (AH) would be capable of 72.5 cold cranking amps (CCA). Goes the other way too. A battery listed as having 100 CCA would be capable of about 13.8 amp/hrs.
Bare in mind it's just a rule of thumb... but it'll get you inside the ballpark.