What are the symptoms of a car battery about to fail?

[StLouis]

Symptoms of a car battery about to fail: 1. The vehicle is more difficult to start than usual, requiring multiple ignition attempts, indicating insufficient starting power; 2. When the vehicle is idling, the headlights quickly dim from bright, showing that the battery power is insufficient and needs replacement; 3. When the battery is nearing the end of its lifespan, it affects the alternator's performance, often causing abnormal noises (usually a slight squeaking sound) during vehicle startup; 4. Normally, the vehicle runs fine, but occasionally, after parking, you may find the entire vehicle without power upon restarting. This happens because, as the battery nears the end of its life, the starting current is insufficient, leading to increased oxidation at the battery terminals and resulting in a complete loss of power.