Car Battery Completely Dead How Long To Charge

Charging a dead car battery takes between 4 to 24 hours for a full charge depending on how many amperes your car battery is charging with and the size of your battery.

Car battery completely dead how long to charge.

If it doesn t the battery might need to be replaced. 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. If your car battery is below 12 volts use a dedicated charger.

Now after few minutes have elapsed you should start the car with the flat battery. Car charging systems normally hover at around 14 volts and car batteries will often read about 13 volts when fully and recently charged. It can be low from lights being left on an internal failure extreme hot or cold temperatures a failing alternator long term storage without being used or any number of other reasons. With that in mind normal car batteries are considered to be fully discharged at 10 5 volts which is only about 80 percent of full.

The most common rate for car battery chargers is around four amps. Let the dead battery charge for a few minutes and then turn the ignition on the vehicle of the dead battery to see if it starts. At least 30 minutes of driving will help charge the battery back to a safe level for your next start. 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.

If it does not work then let the charging continue for few more minutes. Continue doing so for a few minutes.