The two power ratings found on an automotive starter battery are CCA and RC. These power ratings are important factors when selecting the correct replacement battery for your car or truck and should not be overlooked.
CCA: Cold Cranking Amps – This is the amount of current (measured in amps) a battery can “crank out” for 30 seconds at 0 degrees Fahrenheit (-18 degrees Celsius). This rating is important as a battery has to work harder to start your engine in cold temperatures. The higher the CCA rating, the more power the battery can deliver. A battery’s capacity can be reduced by as much as 75% in extremely cold weather. Be sure to select a battery with the highest possible CCA if you live in a cold climate. Never use a battery with a CCA rating lower than your vehicles specified rating! Check your vehicle owners manual if in doubt or check with a salesperson at your local auto supply shop.
RC: Reserve Capacity – This is the length of time in minutes that a battery can provide 25 amps at 80 degrees Fahrenheit (26.7 degrees Celsius). The reserve capacity of a battery is important should the alternator fail as the electrical system in your vehicle will need to be maintained. Headlights, turn signals, car stereos and other accessories will drain a battery quickly if it has a low RC rating. If you tend to use your stereo or other accessories when your vehicle is not running, you might want to consider a battery with a high RC rating when you need to replace it. I hope you’ve found this article helpful. Thanks for reading!