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Author Topic:   Boat batteries
Swellmonster posted 03-10-2003 09:09 AM ET (US)   Profile for Swellmonster   Send Email to Swellmonster  
They classify batteries in CCA "cold cranking amps" for cars and MCA for "marine cranking amps.
My motor calls for 630 MCA or 490 CCA.
Whats the difference?
Barry posted 03-10-2003 11:14 AM ET (US)     Profile for Barry  Send Email to Barry     
CCA = cold cranking amps. Maximum number of amps a battery can supply for 30 seconds at a temperature of 0 degrees F, before dropping to 7.2 volts.

MCA = marine cranking amps. This is similar but is measured at 32 degrees.

Because the CCA test is performed at a lower temperature, it is a more severe test than the MCA test and as a result will have lower numbers.

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