CCA rating is the standard load test for automotive batteries. The test is as follows: the battery is loaded at 1/2 its rated CCA rating. Load is held for 15 seconds. Passing voltage is 9.6 Volts or higher @80 degrees F. The zero degrees test is done @ full CCA LOAD @0 degrres F. As you stated 7.2 volts kr higher is tbe passing voltage. Both test determine battery capacity @ 0 degrres F. Thus is the important test because is the most energy required for an automotive battery. The automotive battery is referred to as SLI service; START; LIGHTS; IGNITION. You asked about temperature.
@ 80 degrees F. Battery power available is 100% ot its rated CCA capacity.
@ 32 degrees F. Battery power available is 85% of its rated CCA capacity.
@ 0 degrees F. Battery power available is 65% of its rated CCA capacity.
@ -20 degrees F. Battery power available is 45% of its rated CCA capacity.
The required cranking power aLso INCREASES as temperature DECREESES.
Then......battery voltage is useless without a temperature reference.
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