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
No, that has nothing to do with idle speed.
Yes.
Dead cell in the battery, any light on the car that is staying on, or a stuck relay.
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.
try checking the battery cables