# How do you read the numbers on a car battery?

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## What do the numbers and letters mean on a car battery?

This refers to the battery size that will best fit the physical dimensions, terminal locations and type required for your vehicle. The Battery Council International (BCI) assigns numbers and letters for each battery group size. Group size is typically based on your vehicle’s make, model and engine type.

## What do the numbers on the bottom of batteries mean?

The numbers following the first two letters are an indication of the battery’s dimensions. Diameter in millimeters is indicated by the first two, in a four digit code, or just the first in a three digit code. The last two numbers indicate the height of the battery in tenths of a millimeter.

## What does N70 battery mean?

N70. Type of rechargeable battery that supplies electric energy to an automobile. An automotive SLI battery(starting, lighting, and ignition) powers the starter motor, lights, and ignition system of a vehicle’s engine.

## What do the numbers on a 12 volt battery mean?

For a 12-volt battery (six cells), RC is the number of minutes it can maintain a voltage of 10.5 volts with a 25-amp draw; therefore, a “75-minute” battery lasts 75 minutes under these conditions.

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## What do the letters mean on a battery?

The letters on a battery give the size, in height and width, of the battery. AA means “50.5mm x 14.5mm.” The later the letter the larger the battery. “D” is larger than “C”, etc. “A” is larger than “AA” is larger than “AAA”.

## How do I know what type of battery I have?

Check the Manufacturer’s Label on the Battery. Usually, all the batteries have labels and other information about the battery provided by the manufacturer. Hence, if the label on the battery is still in good condition, you will be easily able to figure out the type of battery.

## What voltage should a 12-volt battery read when fully charged?

A fully charged battery will typically display a voltmeter reading of about 12.6 to 12.8 volts. If your voltmeter is showing a voltage anywhere between 12.4 and 12.8, that means your battery is in good shape. Any voltage above 12.9 volts is a good indicator that your battery has excessive voltage.

## What does CCA mean on a battery?

Cold cranking amps (CCA) – CCA is critical for good cranking ability. It’s the number of amps a battery can support for 30 seconds at a temperature of 0 degrees F until the battery voltage drops to unusable levels.

## How do I know what size battery to buy for my car?

In order to find the right battery for your car, you’ll need to know the group size.

1. Step 1: Check for the group size on your old battery. …
2. Step 2: Check your owner’s manual for a group size. …
3. Step 3: Search online for the group size. …
4. Step 1: Look on your battery’s label. …
5. Step 2: Check your manual. …
6. Step 3: Check online.
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## What Ah battery do I need?

The key is to use the watts you know to calculate the amps at the battery voltage . For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5 hours. Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours.