A healthy battery shows reading from 12 4 to 12 7 volts when we measure the voltage across the two terminals of the battery with the help of a voltmeter or some other device. Many battery chargers deliver two to six amps some allow you to choose the amperage level and will take at least several hours to recharge a dead car battery.

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Most chargers will do this automatically.

How long to charge a dead battery. Trickle chargers are mainly used to maintain your charge on your battery over a period of time so that it never runs out of charge and you are never left stranded with a flat battery. At least 30 minutes of driving will help charge the battery back to a safe level for your next start. It takes between 4 to 24 hours to fully charge a totally dead car battery depending on how many amperes your car battery charger is charging with and the size of your car battery.

If your car s battery is dead you probably want to start your car within one hour but to fully charge a 52ah size of battery form dead required 10 hours. Along with this the condition of the battery also plays a key role. Another important point not to miss is the capacity of the battery you are charging.

The most common rate for car battery chargers is around four amps. Realistically speaking a flat battery can be charged up to 80 percent in 2 hours. If yours is not automatic make sure that you start off with a slow charge at approximately 2 amps.

On the other hand if the charging is tickling it may take around 24 hours to charge a dead battery completely. You can do this for about an hour before raising the charging amperage. Community answer it will take around 24 hours to charge a dead battery at this load fully.

Mind you sometimes your car s alternator might be faulty and still hinder the dead battery from recharging. There is another way to bring your dead batteries back to 100 of their original working condition. Read the instructions that come with.

Charging a dead car battery using the car s alternator. The battery will demand a lot of current because of the fact that it has been discharged. Around 60 amps or more.

Ez reconditioning battery method of tom ericson. Below 12 volts use a dedicated charger your vehicle s alternator can keep a healthy battery charged but it was never designed to completely recharge a dead car battery if the unit in question reads below 12 volts. Once you are able to start the vehicle using this jump start mechanism the car will by itself turn over to start recharging your connected dead battery naturally.

For example a 12 volts battery will take more time than a 24 volts battery. It can take as long as 24 hours to get the battery up to an acceptable charge depending on how depleted your battery is when you start charging. Even after considering the fact that your battery is dead it will not take an eternity for your battery to charge.

Plug in charger plug the charger in and follow the manufacturer s recommendations on how to charge the battery.