car batterys

Thread Starter


Joined May 22, 2007
how do you find out the Cranking Amps of a car battery if you only know the Cold Cranking Amps, or find the Amp/Hr's of a 650 cold cranking amp car battery


Joined Apr 20, 2004
But an expensive battery test cart that has a humungo ammeter built in, or go to the manufacturer and see what they have as spec's on the battery.


Joined Apr 26, 2005
Cold Cranking Amps is defined as:

Cold Cranking Amps is a rating used in the battery industry to define a battery's ability to start an engine in cold temperatures. The rating is the number of amps a new, fully charged battery can deliver at 0° Farenheit for 30 seconds, while maintaining a voltage of at least 7.2 volts, for a 12 volt battery. The higher the CCA rating, the greater the starting power of the battery.

From the same page ...

Marine Cranking Amps or Cranking Amps ...

This is a rating used to describe the discharge load in amperes which a new, fully charged battery at 32 degrees F (0C), can continuously deliver for 30 seconds and maintain a terminal voltage equal or greater than 1.2 volts per cell. It is sometimes referred to as Marine Cranking Amps or Cranking Amps.