Why is the car battery overheating severely?

[PaulLynn]

The reasons for battery overheating are as follows: 1. The efficiency of converting electrical energy into chemical energy is 50%, and most of this 50% is released as heat, causing the battery to overheat. 2. The battery has internal resistance; the less the charge, the greater the internal resistance. According to P=I*I*R, the power consumed by internal resistance is also converted into heat, leading to battery overheating. 3. After the battery is fully charged, if charging continues, electrical energy is almost no longer converted into chemical energy but almost entirely into heat, causing the battery to overheat. Below are precautions for severe battery overheating: (1) If severe overheating occurs, it indicates that the battery is self-discharging and overheating, suggesting a short circuit inside the battery plates, which means the battery has reached its end-of-life limit. (2) Self-overheating can lead to battery self-destruction, battery swelling, casing rupture, and electrolyte leakage. The battery should be removed and replaced promptly.