What to Do When a Car Battery is Dead?

[FinnDella]

When a car battery is dead and the vehicle cannot start, an external power source is needed to jump-start the vehicle. Common issues include: 1. Disconnect the negative terminal: As long as the battery is connected to the car, many electrical devices continue to draw power, albeit in small amounts, which can last a long time. Therefore, if the vehicle is not driven for an extended period, it is recommended to disconnect the negative terminal of the battery. 2. Self-discharge: Even when no electrical devices are connected, the battery itself will experience some discharge. If the car remains unused for a long time and is not recharged, starting the engine requires a large amount of power, making it prone to draining. Each time the battery is drained, its performance significantly declines. The battery's capacity diminishes over time with use. 3. Cliff effect: Battery discharge exhibits a cliff effect. New batteries have a relatively linear discharge curve, whereas older batteries with degraded performance show a sharp decline. 4. Temperature factor: Weather conditions also play a role, as low temperatures can significantly reduce battery performance.