A typical car battery is rated in two main ways related to amps:
- Cold Cranking Amps (CCA): This is the most common amp rating for car batteries. It measures the battery's ability to deliver a high current at 0°F for 30 seconds while maintaining at least 7.2 volts. Most passenger car batteries have a CCA rating between 400 and 600 amps, but it can range from about 400 up to 1000 amps or more for larger vehicles like trucks and SUVs
- Ampere-Hours (Ah): This rating indicates the total charge capacity of the battery, i.e., how many amps the battery can supply over a period of time. For example, a 48 Ah battery can provide 1 amp for 48 hours or 2 amps for 24 hours. Most standard car batteries range from about 40 to 110 Ah, with 48 Ah being typical for regular cars and around 75 Ah for trucks or SUVs
In summary:
- A typical 12-volt car battery can deliver between 400 and 1000 amps of current for starting (CCA).
- Its capacity in terms of sustained current delivery is usually around 40 to 110 ampere-hours (Ah) , with about 48 Ah common for standard cars.
The exact amp rating depends on the vehicle size, engine type, and battery model. Smaller cars tend to have batteries with lower CCA (400-600 amps), while larger vehicles require batteries with higher CCA (up to 1000 amps or more)