To be technical, a standard wet "flooded lead acid" battery loses half it's power at zero degrees F. So the CCA rating tells you how long it can provide the CCA rating in amps for 30 seconds with the battery voltage not dipping below 7.2 volts. Note that most engines will barely crank at 7.2 volts. 12 volt starters are designed to work a 9-10 volts, NOT 7 and NOT 12. A CCA rating that did not allow a dip below 9 volts would be much more useful.
RC (reserve capacity) tells you how long a battery can supply amperage and not drop below 10.5 volts (for a 12 volt unit) and this makes a lot more sense. RC can be interpolated from an AH amp hour rating) that is required in Europe but rarely given for US car/truck batteries.
Whatever it is you say you disgaree with - still alludes me. I stated that CCAs are often used as a marketing gimmick - and that remains true. If someone is concerned about overall battery power, reserve capacity is every bit as important and sometimes more. A same-size, same power battery can be designed to give high CCA and lower reserve . . . or go the other way and give lower CCA and higher reserve (as often down with batteries sold down south).
CCA is not the only important factor if you need something to start when it's cold. A high CCA will determine how fast the starter actually spins at first crank for a short period of time. Reserve Capacity is a measure of how long the battery can provide power and NOT just a measure of a short 30 second "burst" down to a useless voltage of 7.2
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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