They wear out over time, there could be a parasitic drain on the electrical system, something might have been left on.
When it's really hot outside, the heat can case the battery case to swell. The heat can also drain the battery causing it to go dead, and can cause permanent damage.
Yes. If it is loose on the side that comes from that alternator, then the alt. is not getting the opportunity to charge the battery. So basically you're running your car on pure battery and it will go dead accordingly
A storm has nothing to do with the battery going dead.
if anything is running off the battery (visibly on) the battery will eventually go dead
A completely dead battery or a bad connection to the battery.
Dead cell in the battery or something is on pulling power from the battery.
THE BATTERY WILL GO DEAD
No. But if left for a very long time any battery will go dead. you have to leave the battery hooked up to terminals for that the battery will contantly charge while being used in your car otherwise the battery will eventually go dead.
If the battery is dead the alarm will not go off
No, the alternator takes over for the battery once the car has been cranked. Try this, start the car; remove the positive cable from the battery; if the car dies, then you have a faulty alternator. Of course it makes sense to make sure the battery cables are tight at all times.
Car no go.
No. A loose battery connector will cause problems drawing power from the battery to start the vehicle, and it may present a bit of a problem charging it (but that is not likely because the charging current is low compared to the starting current). If you have a loose connector and the battery goes dead, clean and tighten your battery terminals and start making some checks. The loose connector will not cause your battery to go dead.