Not all batteries behave the same, which makes cca to ah estimation tricky. Lead-acid, AGM, and lithium batteries all have different characteristics. This article explains how battery chemistry impacts both CCA and Ah ratings and why the same CCA value can result in very different Ah capacities depending on the battery design. https://manlybattery.com/battery-tools-and-resources/battery-cca-to-ah-calculator/