Fire hazard: Extension cords are typically designed for indoor use and may not be able to handle the high current required for jump-starting a vehicle. This could cause the cord to overheat, melt, or even catch fire, potentially starting a vehicle fire.
Overloading: Using an indoor extension cord for jump-starting can overload the circuit, exceeding its rated capacity. This can cause circuit breakers to trip, damaging the electrical system of the vehicle or the household.
Insufficient Power: Indoor extension cords may have a lower gauge wire compared to jumper cables specifically designed for jump-starting, resulting in insufficient power delivery. This can make the jump-start attempt ineffective.
Damage to Electronics: The sudden surge of power during jump-starting can cause damage to sensitive electronic components in the vehicle, such as the ignition system, electrical control units, or onboard computers.
Personal Injury: If the extension cord is not properly handled, it could become tangled or come into contact with water or other conductive materials, posing a risk of electrical shock to anyone nearby.
Inadequate Grounding: Proper grounding is essential for safe jump-starting. Indoor extension cords may not have proper grounding connections or may not provide adequate grounding for the vehicle, increasing the risk of electrical accidents.
Therefore, it is strongly advised to use jumper cables specifically designed for jump-starting vehicles, as they are built to handle the high current loads safely. Always follow the vehicle manufacturer's recommendations and safety precautions when jump-starting a battery.