IT COULD BE ONE OF THE COOLING FANS RUNNING, BAD RELAY.
That should not be required. It sounds to me like something was left unplugged.
sounds like you have an air leak in the system. yes it will drain the battery, the air compresser is working to over come the leak
Check your alternater. Sounds like it is bad in which case you are running just on the power from your battery which won't last long.
it sounds like the relay under the hood next to the fuse panel is stuck on replace it the owners manual will tell you witch one
It sounds like your battery is dead...Get it charged, start the car, then check the alternator output to ensure it's upwards of 13volts (but less than 16), if it isn't you're just draining the battery when you drive.
This is gonna be fairly unspecific but it sounds as if you have some loose electrical wiring and it is probably grounding out or shorting out on your frame. Once you find the break or loose wiring clean it up and you should be ok.
Sounds like it may have been replaced at one point with an inferior piece.
sounds like electric fan failure
sounds like the battery short-circuited.
That sounds suspiciously like a corroded battery terminal.
Sounds like you may have a short or something that is draining the battery. Try recharging the battery and then make sure all lights, radio, etc. are off. If you can't find anything left on, try removing the negative battery cable, if you are sufficiently knowledgable, until you need it again, and then reinstall the cable and see if it starts okay. If it does, then you may have a short draining the battery. Driving it regularly may keep it charged enought to start, letting it sit may allow it to drain enough power to keep it from starting. Good luck.
Sounds like the wax gasket is leaking or a crack in the bowl. Is the floor dry.