Car battery fully charged how long

The higher the revolutions per minute RPM of your engine, the faster the battery will charge. Faster speeds generate more RPM. Your battery can charge driving at city speeds, but it will take longer. Another thing that will help is to turn off all components powered by the battery. Drive during the day so you can turn off the headlights.

Also, turn off the radio, and avoid using charging ports or other electronic components. One possibility is that the battery is old or worn out.

Most batteries last between 5 and 7 years from the date printed on the label. Deep discharges and high temperatures can shorten its lifespan, however. The other possibility is that your alternator is failing. The exact time depends on how many amps the charger sends at any given time. Fast charging devices can fully charge a dead battery in as little as 10 hours. Other models may take as long as 24 hours get back to full capacity.

Be careful to strike a balance between speed and safety when using a battery charger. You can find chargers rated as high as 40 amps.

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In order to calculate the amount of amp - hours in a battery , multiply the reserve capacity by 0. In the case of a MT, minutes RC x 0. Step 2: Before charging a battery , use a voltmeter to measure the remaining voltage in the battery.

For example, if the voltmeter shows a voltage reading of This means there are about half of the 72 amp hours in the battery. Step 3: Charge the battery at a amp rate. Take the amount of amp-hours needed by the battery and divide it by 10 amps.