TECH TIP #107 –- CLASSIFYING YOUR BATTERY
Did you know that batteries are usually classified in three ways?
Group size – this indicates the physical dimension of the battery. It is determined by the Battery Council International group size number, which can be either all numbers or a combination of letters and numbers.
Cold Cranking Amperage (CCA) –the number of amps a battery delivers for 30 seconds at 0 degrees F, while maintaining at least 7.2 volts for a 12-volt battery.
Reserve Capacity — this shows the number of minutes a battery can take a 25-amp continuous discharge while maintaining at least 20.5 volts at 80 degrees F. It actually indicates how long a vehicle would run with limited accessories if the alternator completely failed.