How Long Should You Drive to Recharge a Dead Battery?

[BriellaFitz]

After the battery is dead, using the car's alternator to fully recharge the battery requires maintaining an engine speed of over 2000 RPM, and the car needs to be driven for at least 4 hours. Signs of a failing car battery are as follows: 1. Difficulty starting the car: If the car suddenly has trouble starting without other factors, it may be a sign that the battery is about to fail. 2. Dimming lights when idling: For example, when waiting at a red light or temporarily parked, the headlights suddenly dim. This is because the charging power of the engine decreases during idling. 3. Battery warning light illuminates: When the battery warning light comes on, it alerts the owner to have the battery inspected and repaired at a service center. 4. Normal driving but occasionally no power after parking and 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, resulting in a complete loss of power.