No, You do not need a key fob to start a car. When starting a car, you put the key in the ignition and turn. Power comes from car battery, not from the key fob battery!
Dead battery, car will not start
Certainly, a loose wire on the car battery can cause the car not to start.
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.
No, you cannot push start a manual car with a dead battery. Push starting requires the battery to have some charge to ignite the engine.
Weak battery and no gas can both cause a no start.Weak battery and no gas can both cause a no start.
dead battery
An example of a situation where the cause of an issue was easily identifiable is when a car won't start because the battery is dead. In this case, the dead battery is the clear cause of the problem, and once it is identified, replacing the battery can solve the issue.
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.
Dead battery ?
from a dead battery to working battery
Yes, one bad cell in a car battery will cause the car not to start.
Do you mean "jump start"? If so, yes- it requires a car with a good battery, and a set of jumper cables- connected the RIGHT way between the two vehicles. With older vehicle, it was possible to "push start" the car with the dead battery- but with modern electronics, and a completely dead battery, will not work.