Most likely a weak or dead battery. Replace and get your alternator tested. If you have a voltmeter check by placing both probes across the battery and you should have about 14 volts while running or 12.6 with no load, and engine off.
No, your battery supplies power to the starter. However if your alternator is defective then it will not supply power to the battery and the battery will soon be depleted.
If you are using it to turn on the car a good battery would help.
Check the battery cables or starter.
When you say "it would not start", do you mean it will not crank(nothing happens when the key is turned)? or it will not start?( engine cranks but doesn't fire?) You need a new battery. I had the same problem with my 1989 Bonneville, It would start ou good but as soon as I pressed on the brakes, the car would turn off.
I would not I would buy a 12 volt charger and plug it in for a day
what type of car do you own thanks
9 or so would give you the correct voltage but they would not give you the amperage that a car battery would give you and that you would need to start the car.
Sounds like a short on one of the battery cells. Get the local tyre and battery shop to check the battery out
no if the car doesnt start check the battery and the alternator and the starter.
Certainly, a loose wire on the car battery can cause the car not to start.
From your description I would say you could rule out the battery but not the alternator (the part that charges the battery) but it's most likely the starter
If your battery is dead then you are going nowhere therefore why would you need to take the car out of park? Get a jump start from another car with a good battery and then you can start your car and drive to the nearest battery dealer and buy a new battery if need be. Otherwise just put a battery charger on your battery and let it fully charge.