What Are the Reasons for a Car Battery Having Power but Failing to Start the Engine?

[LaEden]

The reasons for a car battery having power but failing to start the engine are: 1. Insufficient battery voltage; 2. The gear is in D (Drive) position, preventing ignition; 3. Damaged fuel pump leading to inability to pump fuel; 4. Severe carbon buildup in the throttle body. The functions of a 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 vehicle's electrical equipment when the engine is off or idling at low speed; 3. Assisting in powering electrical equipment when the alternator's output is insufficient; 4. Cushioning voltage surges in the electrical system to protect the vehicle's electronic devices; 5. Storing excess electricity generated by the alternator.