You're on the right track! "A" definitely refers to amps, but MCA stands for Marine Cranking Amps.Here's a breakdown: MCA (Marine Cranking Amps)

This is the number of amps a battery can deliver for 30 seconds at 0 degrees Celsius (32 degrees Fahrenheit) while maintaining a voltage of at least 7.2 volts. It's a standard used to rate batteries intended for use in marine applications, specifically for starting engines.

Key Differences from CCA (Cold Cranking Amps)



Temperature

MCA is measured at 0°C (32°F), while CCA is measured at -18°C (0°F).*

Target audience

MCA is commonly used for batteries intended for marine usage, whereas CCA is a term more widely used when discussing automotive batteries.

In summary: MCA is a specification for battery performance, indicating its ability to start a marine engine in relatively cold conditions. The higher the MCA, the more starting power the battery has. Flag for review