There is a way to start a car with a flat battery. However, before we explain it, please note that from a mechanical standpoint it is not very advisable. Starting a car with a flat battery in this way could damage the catalytic converter because the fuel goes out the exhaust unburnt. So only do it in case of emergency. On OneHowTo.com we explain how to start a car with a flat battery.
To start a car with a flat battery, either you'll need someone else's help or the car must be on a downward slope. The reason is that the first push should come with no help from the machine. While on a slope, the car will begin to move if you release the brake, but if it is on a flat surface, you'll need someone to push. The car will not start with this method if the battery is completely discharged.
The first steps to start a car with a flat battery are to put it in neutral and start the ignition. Then release the handbrake and, if you're on a slope, the car will start to move. Otherwise, you will need a push. Be very careful because the brake will be very hard to push until the engine starts, so it will not be very responsive in an emergency.
Once the car with a flat battery is running, wait for it to reach a speed of about 10 kilometres per hour, and then push the clutch all the way down and change into second gear. You know your car best, so you'll know at what point you can step on the clutch and change into second gear.
Release the clutch smoothly and inertia will make the engine start. The battery will recharge somewhat once the car is running, allowing you to drive normally. However, you need to drive smoothly and avoid unnecessary stops, so that the battery does not go flat again, leaving you unable to start the car.
After starting a car with a flat battery we recommend that you visit your trusted workshop to determine the state of the battery and the reasons that led to it going flat.
Please note that starting a car with a flat battery should be a last resort because you could damage the catalytic converter, which can cost over 500 euros (400 GBP or $570)
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