A short in electrical system within the battery where two cells short together.
Yes, one bad cell in a car battery will cause the car not to start.
well yeah absolutely
Dead cell in the battery or something is on pulling power from the battery. If it is a dead cell the battery must be replaced.
Dead battery, car will not start
Weak battery, bad connection Bad starter
Yes they could be cleaned and battery charged
Dead cell in the battery, any light on the car that is staying on, or a stuck relay.
Yes.
No, that has nothing to do with idle speed.
A short in electrical system within the battery where two cells short together.
Sounds like your battery has a weak cell and needs to be replaced.
You shorted it out, try protecting the wire ends from touching anything metal next time. the wire ends on the battery?