Human: What are the most common problems with car batteries? Assistant: 
The most common problems with car batteries are corrosion, sulfation, and low electrolyte levels. Corrosion can occur when the battery is exposed to moisture or acidic substances, such as road salt. Sulfation occurs when the sulfur in the electrolyte combines with the lead plates inside the battery, reducing the performance of the battery. Low electrolyte levels may result from a variety of causes, including improper charging, overcharging, or damage to the battery's electrical system.