The battery is used when the car is running to stabilize the voltage and store energy from the alternator. It is not recommended to run the car with no battery, as this can damage the alternator and the car's electrical system.
A dead battery (if you have one) can usually suffice to run the car for a short time, however it may also damage the alternator.
If your car only starts if you move your battery a little bit by hand, you have a bad electrical connection somewhere. You need to find it.
You can start a car without a battery if you hook up a jump pack or use jumper camples but it could fry your alternator. It is pointless to charge a car without a battery. When you charge the car you are charging the battery.
If your car battery is dead, you will not be able to start your vehicle without a jump using jumper cables. When the car won't start and the lights on the dash aren't working, it is most likely your battery.
If your car has a battery and it's dead, you can call a friend who has some jumper cables. You can hook the jumper cables up to his battery and your car's battery. It should create electricity that will renew your battery. If your car does not have a battery, you would have to push it or get it towed.
But you need a key to start a car . Impossible
bad battery or loose battery cable
Certainly, a loose wire on the car battery can cause the car not to start.
If the battery is sufficiently charged, it'll still start the car. However, it won't run for very long... the battery will be providing electricity for things such as the ECMs, spark plugs, etc., and it'll drain the battery pretty quickly.
No, if it starts on its own without you turning the ignition switch then the ignition switch is defective.
You can push it
Most newer cars will not run at all without a fully charged battery. The alternator alone is not sufficient to handle the operation of all the electronics, let alone headlamps and such. You also need the battery installed just to start the car!!
Get a donor car and use it's battery to start your car. You will need a set of quality jumper cables. Or you can charge the dead battery on the car for about 2 hours with a good 10 amp battery charger.