How long does it take to charge a dead car battery to start the engine?

[McAsher]

It takes about 1 to 1.5 hours to charge a dead car battery sufficiently to start the engine. The steps to start the vehicle are: 1. Turn the key to the 'on' position and wait; 2. After the dashboard icons stop flashing, turn the key to the 'start' position to ignite the engine. The functions of the car battery include: 1. Providing power to the starting system, ignition system, and electronic fuel injection system when starting the engine; 2. Supplying power to the car's electrical devices when the engine is off or idling at low speed; 3. Assisting in powering electrical devices when the generator's output is insufficient; 4. Mitigating voltage surges in the electrical system to protect the car's electronic devices; 5. Storing excess electricity generated by the alternator.