Why does the battery light come on and the car won't start?

[RuthLynn]

The reason the car won't start and the battery indicator light is on is that the battery is depleted and needs to be replaced. Here are some methods to extend battery life: 1. Regular battery usage: Many cars use lead-acid batteries. If the car remains idle for extended periods, the sulfuric acid inside will settle, leading to natural discharge. Prolonged occurrences of this will result in insufficient power supply and significantly reduce battery lifespan. 2. Clean the battery terminals: The area around the terminals isn't completely sealed. When the car is running, movement can cause electrolyte to leak from the terminals. This electrolyte can undergo chemical reactions in the air, affecting the battery's normal operation. 3. Regularly check the alternator: Since the battery relies on the alternator for charging, any issues with the alternator will greatly impact the battery. This not only causes insufficient power supply but also continuously drains the battery's durability, so special attention should be paid to the alternator as the source.