What Is Cold Cranking Amps?

Cold Cranking Amps (CCA) measures the electrical current a car battery can output for 30 seconds at zero degrees Fahrenheit without dropping below minimum voltage. Drivers usually encounter this specification when buying replacement batteries or comparing battery specifications for jump starters.

How Cold Cranking Amps Affect Engine Starting

A higher rating means the battery can deliver more power to turn over a cold engine in freezing temperatures. Cold weather thickens engine oil and slows internal chemical reactions, requiring extra energy to crank the motor. For example, a large truck or diesel engine generally needs higher amperage to start than a compact sedan.

Selecting the correct rating depends on your local climate and vehicle manufacturer requirements. Using a battery with lower amperage than recommended can lead to slow cranking during winter months. Always consult the vehicle manual for exact requirements. If you are also shopping for emergency power, see our guide to the best portable car jump starters.