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What do the numbers on your battery mean?

Your battery label contains a series of numbers and letters giving information on the voltage or nominal voltage expressed in volts (V), the capacity expressed in ampere-hours (Ah) and the starting power or current expressed in amperes (A).

Nominal battery voltage

The nominal voltage of a car battery is generally equivalent to 12 V for passenger cars, divided into six parts of around 2.2 volts each. Each cap corresponds to a cell.

24-volt batteries are designed for heavy trucks and certain military vehicles. 6-volt batteries, on the other hand, are best suited to classic cars and collectors' vehicles.

Car battery capacity

A car battery's capacity is the maximum amount of current it can deliver in an hour, and the amount of energy it can give back in 20 hours.

This value is expressed in ampere-hours (Ah). In principle, a 100 Ah battery can deliver 100 A for one hour, or 5 amps for 20 hours.

Cold starting power (CCA)

Cold CrankingAmperage (CCA) indicates the current a 12-volt battery can deliver for 30 seconds, at a temperature of -18°C, without the voltage dropping below 1.4 volts per cell.

Starting power is expressed in amperes (A). The higher it is, the more powerful the car battery. This indication can be important for cars driving in cold conditions.

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