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This was the first result on Google
(lemmy.ml)
This is a most excellent place for technology news and articles.
I specifically looked at the available specs at the local auto parts stores and couldn't find Ah details. This was about 2y ago, so maybe this value is becoming more commonplace. I know in the RV/Sailing works Ah is used pretty exclusively. My deep cycle AGM only lists CCA and reserve capacity
With the rise in power banks and phones being rated in Amp Hours, I think this may be a recent change, and certainly one I have noticed.