# What is a battery reserve capacity

## What is a good battery reserve capacity?

Reserve Capacity (RC) is a very important battery rating. This is the number of minutes a fully charged battery at 80°F will discharge 25 amps until the battery drops below 10.5 volts. An amp hour (AH) is a rating usually found on deep cycle batteries.

## How do you calculate the reserve capacity of a battery?

Multiply the reserve capacity by 60 to convert it to seconds. For example, if a battery offers a 100-minute capacity: 100 x 60 = 6,000 seconds. Multiply this length of time by 25, which is the battery’s amperage. Example: 6,000 x 25 = 150,000.

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## What is the capacity of a 12v car battery?

It refers to the number of amps a 12-volt battery can deliver at 0°F for 30 seconds while maintaining a voltage of at least 7.2 volts. For example, a 12-volt battery with a 600 CCA rating means that at 0°F, the battery will provide 600 amps for 30 seconds without dropping below 7.2 volts.

## What is the difference between amp hours and reserve capacity?

The 140-minute reserve capacity indicates the number of minutes a battery can deliver 25 amps of current without dropping below 10.5 volts. An interesting rule of thumb is that typically if you divide a given reserve capacity by two, you will derive the approximate amp hour capacity.

## Is a higher Ah battery better?

The batteries with higher amp hours deliver more power and more performance, allowing the battery to work for a longer time on a full charge as compared to the cells with lower amp hours. … As the AH or amp-hours rating of the battery indicates the consumers about the amperage that a battery will provide in one hour.

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## How long will a 100ah battery last?

A battery rated for 100 amp hours is usually rated for that capacity when discharged at a 20 hour rate. In other words, 100ah / 20hr= 5 amp load for 20 hours.

## What does 20 hr mean on a battery?

You may see “20HR” on your battery and wonder what does it mean. Simply said it means 20 Hour Rate. … This basically means that the battery can discharge 1 amp per hour over a 20 hour period. A High Rate battery with the same amperage (20Ah) and with 10HR will be able to discharge 2 amps/hour over a 10 hour period.

## How many watts is an amp hour?

Step A: Convert watts to amps

Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours. If you are using a different voltage battery the amp-hours will change by dividing it by the battery voltage you are using.

## Can I put a lower Ah battery in my car?

The battery also acts as a surge protector absorbing any power surges by the alternator. So if you have a bone stock car with no 100/90 headlamps or Aftermarket amplifier and stereo, you can go for the lower ampere battery without issues.

## What does 60 Ah mean on a car battery?

60 Ah is the current that the battery can supply in ampere hours, and 12 volts is the voltage of the battery. Industry standard is calculated at a 20 hour rate. So if no other markings are on the battery you can assume a 60 Ah battery will delivery 3 amps for 20 hours.

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## How many cold cranking amps do I need?

The standard recommendation is a battery with at least one Cold Cranking Amp (CCA) for every cubic inch of engine displacement (two for diesels). CCA rating is an indication of a battery’s ability to deliver a sustained amp output at a specified temperature.

## Is 11.9 volts enough to start a car?

A flat battery can show 12 volts , but not be good enough to start a car . … 11.9v indicates the battery is completely discharged. Anything under 12.2v means the battery is in a state of discharge, and a healthy battery should show 12.6v in a static state.

## Can a completely dead battery be recharged?

A car battery is considered discharged when the voltage drops below 12 volts. While your vehicle’s alternator can keep a healthy battery charged, it was never designed to completely recharge a dead car battery. … Most of the time, you don’t even have to remove the battery from your vehicle.