What are the methods to check if the car battery has power?

[McAndres]

Methods to check if the car battery has power are: 1. Check the battery's charge indicator; 2. Measure the battery's static voltage; 3. Check the battery warning light; 4. Observe if the dashboard flickers or dims when starting the car; 5. Inspect the battery for signs of swelling, deformation, oxidation, or leakage. Reasons for a dead battery include: 1. Insufficient battery electrolyte; 2. Internal malfunctions causing battery damage. Functions of the battery: 1. Powering the engine starting system, ignition system, and vehicle electrical supply; 2. Providing power to the car's electrical devices when the engine is off or at low idle; 3. Assisting in power supply when electrical demand exceeds the generator's capacity; 4. Acting as a voltage stabilizer for the vehicle's electrical system, mitigating voltage spikes and protecting electronic devices in the car.