Answer :
Final answer:
12-volt automotive batteries are primarily rated by Cold Cranking Amps (CCA) and Reserve Capacity (RC). Although weight can provide some indication of capacity, it is not a direct rating method. Internal resistance is a technical consideration but not a standard consumer rating.
Explanation:
Rating of 12-Volt Automotive Batteries
12-volt automotive batteries are rated based on the following key factors:
- Cold Cranking Amps (CCA): This rating indicates the battery's ability to start an engine in cold temperatures. It measures the amount of current the battery can supply for 30 seconds at 0°F while maintaining a voltage of at least 7.2 volts. A higher CCA rating is preferred for colder climates.
- Reserve Capacity (RC): This value represents the time a fully charged battery can sustain a minimum voltage (usually 10.5 volts) under a specific load (typically 25 amps). It is crucial for situations when the alternator fails, or the engine has to be run without recharging the battery.
- Weight: While weight itself is not a direct rating, it can indicate the size and number of internal plates in the battery, which contribute to its overall capacity and performance. Heavier batteries often store more energy but are not rated by weight alone.
- Resistance: This refers to the internal resistance of the battery, but it is not a standard way to rate a battery. Internal resistance influences the efficiency and performance of the battery but is typically not part of the consumer specifications.
In summary, the most relevant ratings for 12-volt automotive batteries are Cold Cranking Amps and Reserve Capacity.
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