Understanding Batteries

Cold Cranking Amps (CCA) or Starting Power

The Cold Cranking Performance (CCA) measures the starting performance of your vehicle. In layman’s terms, the higher the CCA, the easier it will be to start the vehicle.

It is the amount of current a battery can provide at 0 °F (−17.8 °C). The rating is defined as the current a battery at that temperature can deliver for 30 seconds and maintain at least 7.2 volts.

Battery performance drops off quickly with temperature, so this is a good indication of a battery’s starting ability - the higher the CCA the better. If you check the details on our battery page, you’ll see for example that the Silver Calcium batteries have a higher CCA than an equivalent M-Tec, and both have higher than a standard battery.

Reserve Capacity (RC)

The Reserve Capacity is a battery’s ability to maintain a minimum stated electrical load. The rating is the number of minutes a fully charged battery at 26.7°C can be discharged at 25 amps until the voltage falls below 10.5 volts.

Reserve Capacity is useful when you have additional electrical appliances running in your car, which have a high drainage on the battery, such as DVDs, sat navs, heated seats and windows. When shopping for batteries a higher Reserve Capacity is always better.

Amp Hours (A/Hr)

Or Ampere-Hour Capacity, measures the total amount of electricity stored in a battery.

An Amp-hour represents the amount of electricity when a current of 1 Amp passes for 1 hour.

The Amp-Hour Capacity is the amount of electricity that a battery will deliver during 20 hours before the voltage falls to 10.5V. For example, a 60Ah battery will deliver a current of 3A for 20 hours. Likewise a 90Ah battery would deliver a current of 4.5A for 20 hours.

The Amp-Hour capacity varies with the rate at which the battery is discharged. The slower the discharge, the greater the amount of electricity that the battery will deliver.

Use our battery page to view our competitive prices and find the right battery for your car.

Cold Cranking Amps (CCA) or Starting Power

The Cold Cranking Performance (CCA) measures the starting performance of your vehicle. In layman’s terms, the higher the CCA, the easier it will be to start the vehicle.

It is the amount of current a battery can provide at 0 °F (−17.8 °C). The rating is defined as the current a battery at that temperature can deliver for 30 seconds and maintain at least 7.2 volts.

Battery performance drops off quickly with temperature, so this is a good indication of a battery’s starting ability - the higher the CCA the better. If you check the details on our battery page, you’ll see for example that the Silver Calcium batteries have a higher CCA than an equivalent M-Tec, and both have higher than a standard battery.

Reserve Capacity (RC)

The Reserve Capacity is a battery’s ability to maintain a minimum stated electrical load. The rating is the number of minutes a fully charged battery at 26.7°C can be discharged at 25 amps until the voltage falls below 10.5 volts.

Reserve Capacity is useful when you have additional electrical appliances running in your car, which have a high drainage on the battery, such as DVDs, sat navs, heated seats and windows. When shopping for batteries a higher Reserve Capacity is always better.

Amp Hours (A/Hr)

Or Ampere-Hour Capacity, measures the total amount of electricity stored in a battery.

An Amp-hour represents the amount of electricity when a current of 1 Amp passes for 1 hour.

The Amp-Hour Capacity is the amount of electricity that a battery will deliver during 20 hours before the voltage falls to 10.5V. For example, a 60Ah battery will deliver a current of 3A for 20 hours. Likewise a 90Ah battery would deliver a current of 4.5A for 20 hours.

The Amp-Hour capacity varies with the rate at which the battery is discharged. The slower the discharge, the greater the amount of electricity that the battery will deliver.

Use our battery page to view our competitive prices and find the right battery for your car, call in to your local branch, call us on 0114 2766661 or use the Contact Challenger Form below for more information.