How many amp hours in car battery?

The CCA of batteries varies from one battery to the next. Normally the higher CCA the more the battery costs. Just buy one that is at least as big as the OEM battery.

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CCA is not equivalent to ampere-hours. One ampere-hour is equal to 3600 coulombs (ampere-seconds), the electric charge transferred by a steady current of one ampere for one second. A coulomb is one ampere times one second. An ampere (and coulomb) is 6.241 × 1018 electrons in one second passing a point in a circuit.

CCA is the max number of amps a car battery can deliver in each second until it is discharged below a certain amount of electrons.

So how many amp-hours in a car battery? It depends--on the size of the battery. Larger cells mean more amp-hours stored in each cell.