car batterys

Discussion in 'General Electronics Chat' started by penman1964, May 22, 2007.

  1. penman1964

    Thread Starter New Member

    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
  2. beenthere

    Retired Moderator

    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.
  3. JoeJester

    AAC Fanatic!

    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.