Why does the BMW 3 Series Convertible suddenly lose all power?

[MicahMarie]

BMW 3 Series suddenly losing all power is caused by a malfunction in the car's battery. Solution: If the car's battery is malfunctioning, you need to promptly visit the car's 4S shop or a repair shop to inspect or replace the battery to resolve the issue of the car losing all power. Reasons for battery malfunction: After the battery has been used for a period of time, sulfates naturally accumulate on the plates, affecting the battery's normal operation (the battery light turns on). These sulfates need to be promptly removed to resolve the issue. First, use a high current (within 5-hour rate) to fully charge the battery. Without exceeding a liquid temperature of 40 degrees, discharge 30% of the battery to flush out the slight sulfate buildup on the plate surfaces, causing them to detach, dissolve, and convert back into active material. Repeating this process three or four times can repair the sulfation phenomenon in the car battery.