1. Voltage:
* 12V: This is the standard voltage for most car batteries.
* 6V: Some older vehicles, like golf carts, use 6V batteries.
2. Cold Cranking Amps (CCA):
* The most important rating for starting your car in cold weather.
* CCA measures the battery's ability to deliver current at 0°F (-17.8°C) for 30 seconds while maintaining at least 7.2V.
* Higher CCA means a stronger battery.
3. Reserve Capacity (RC):
* Indicates how long a battery can power essential accessories at a specific load (25 amps) without the engine running.
* Measured in minutes.
* Higher RC is better for extended periods without the engine running.
4. Amp-Hour (Ah):
* Measures the amount of electrical charge a battery can deliver over a specific time.
* Higher Ah is better for deep-cycle applications like powering accessories for extended periods.
5. Battery Size (Group Size):
* A code that identifies the battery's physical dimensions.
* Common group sizes include:
* Group 24: Common for full-size cars and trucks
* Group 34: Larger capacity, often used for heavy-duty applications
* Group 35: Similar to Group 34, but with a slightly different terminal placement
6. Battery Type:
* Lead-Acid: The most common type, inexpensive and widely available.
* AGM (Absorbent Glass Mat): Lead-acid with a glass mat separator, providing better vibration resistance and higher cranking power.
* Gel: Lead-acid with a gel electrolyte, even more resistant to vibration and spills.
7. Battery Terminal Placement:
* Positive (+) and Negative (-) terminals can be on either side or the top.
* Check your car's manual to find the correct terminal placement.
8. Other Important Ratings:
* Warranty: Covers battery defects for a specific period.
* Maintenance: Some batteries require periodic top-off with distilled water (flooded batteries), while others are sealed and maintenance-free.
To choose the right car battery, consider:
* Your vehicle's make and model.
* Climate conditions.
* Driving habits and accessory use.
Consult your car's owner's manual or a trusted mechanic for specific recommendations on the best battery for your car.
