The most common reason for a vehicle not to turn over is a bad alternator. If the alternator is not charging the battery the engine will not start, regardless of the battery age.
Either there is a dead cell in the battery or something is drawing power from the battery. Even a good battery will slowly discharge over time. Normally it will take months.
assuming the battery and cables are good and connected....check the ignition switch..:)
If the engine will not turn over, that is, sound like it is turning, then the trouble is a dead battery or really bad battery clamps. If the engine will not 'catch' and start running, then there are a number of causes, one of which is having no fuel.
Dead battery.
It varies widely from around 300 on a small car to over 1000 on a truck battery.
why do aaa batteries overheat
Can be a dead cell in the battery which will fully discharge the battery over night. The battery must be replaced. Of course any battery will loose it's charge over a few months of storage.
I would not buy one that is over 6 months old. But the shelf life is at least a year. After the battery sits on the shelf for over 3 months it is a good idea to charge it before putting it into service.
I would not buy any battery over 6 months old.
Try New Battery or borrow New Battery and go from there
Your truck will not turn over when the key is turned if the battery is dead, the ignition switch has failed, or the starter is bad. All can be readily repaired at a local mechanic or dealership.
Turns over but will not start or will not turn over? Is there a small wire at the battery, positive side that is not connected?