MCA is cranking amps measured at 0°C
CCA is cranking amps measured at -20°C
cranking amps is the amount of amps the battery can deliver from fully charged to depleting itself to about 9.6V over 30 seconds. Or something like that.
After Looking at these batterys myself, I done a bit of serching and found out a converstion, this is what I found, hope it helps..
"COLD CRANKING AMPS (CCA)
The CCA rating represents in amps the current flow the battery can deliver for 30 seconds at 0o F. without dropping below 1.2 volts per cell (total of 7.2 volts for a 12-volt battery). The higher the number, the more amps it can deliver to crank an engine.
MARINE CRANKING AMPS (MCA)
Batteries designed for marine use may be rated at MCA instead of CCA. The MCA rating method measures battery output at 32o F., not 0o F. A battery's MCA rating will be one-third higher than its CCA rating would be.
To compare two batteries when one has an MCA rating and the other has a CCA rating. multiply the CCA rating by 1.3 for the equivalent MCA rating. Or, multiply the MCA rating by 0.77 for the equivalent CCA rating. Example:
500 CCA x 1.3 = 650 MCA
or
650 MCA x 0.77 = 500 CCA"
From the reviews looks good, I am thinking about buying one, if its no good it'll go in my Caravan as I need one in that for this year, or as a second battery...at that price cant loose
