Choosing the Right Car Battery
A car battery label is packed with codes and numbers. Here's what they mean, so you can match a replacement to your vehicle with confidence.
1. Voltage
Almost every passenger car battery is 12V. That's the starting point. It won't help tell batteries apart, but it's worth confirming.
2. CCA (cold cranking amps)
CCA tells you how much current the battery can deliver to start the engine in cold conditions. A higher number means more starting power. Choose a battery with a CCA rating at least equal to what your vehicle manufacturer specifies. Diesels and larger engines generally need more.
3. Capacity (Ah or RC)
Capacity, shown in amp hours (Ah), is how much energy the battery stores. Some labels show reserve capacity (RC) instead, which is how long the battery can power essential systems if the charging system fails. Higher capacity suits vehicles with more electrical demand, including start-stop systems and lots of accessories.
4. Size code
The size code tells you the physical dimensions and layout of the battery. Different markets use different systems. Japanese-standard (JIS) codes are common in New Zealand because of the number of Japanese vehicles, and they look like NS60 or N50ZZ. European batteries use DIN codes, such as LN2 or L3.
The size code matters because the battery has to physically fit in the tray and under the hold-down clamp.
5. Terminal position
Check which side the positive (+) terminal is on. Many size codes end in an L or R to show this, but the safest approach is to compare the new battery directly with the one in your vehicle. Cables that are too short, or terminals on the wrong side, can be a problem.
6. Date code
Batteries lose charge slowly while they wait on the shelf, so freshness matters. Most batteries carry a date code showing when they were made or shipped. The format varies between manufacturers, so check the manufacturer's information if you can't interpret it.
7. Technology type
Standard flooded batteries suit most older vehicles. Vehicles with start-stop systems typically need an EFB or AGM battery. Always replace like with like, or with the type your manufacturer specifies.
Quick checklist
Voltage: 12V
CCA: at or above the manufacturer's specification
Size code and terminal position: match the original
Technology: same as the original (flooded, EFB or AGM)
Date code: as fresh as possible
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