What is the cross-sectional area of car battery cables?

[Andy]

For small passenger vehicles, the national standard recommends pure copper cables with a cross-sectional area of 16 square millimeters. However, for large engineering vehicles, the recommended national standard is 25 square millimeters of pure copper. If the cable size falls below the recommended value, it may be difficult to jump-start the engine. With constant power and voltage, thicker cables have lower resistance, ultimately delivering greater current to the starter motor. Additional information: Precautions for using car batteries: Ensure the auxiliary battery is 12V and the negative terminal is properly grounded. Of course, all unnecessary lights and accessories should be turned off to prevent electrical accidents. Never reverse the polarity of the cables, as this may cause sparks during connection. Additionally, make sure the cables are tightly secured to both battery terminals (for full contact) to avoid sparking during the jump-start process.