Battery Cold-Cranking Amp Temperature Adjustment By Bowling &
Grippo
The definition of the Cold-Cranking Amperage (CCA) of an automotive battery
is the amount of current a given battery can deliver for 30 seconds at
zero (0) degrees F without dropping below a specified cutoff voltage
(manufacturer-specific, but usually 10.5 volts). The value of CCA
will change with battery temperature, CCA increasing with higher temperatures.
The following derates a given battery CCA to ambient temperature. Inputs
are CCA in amps, the CCA rating temperature (usually 0 degrees F), and
the battery temperature in degrees F.