I have a 00 Stratus 2.4L.
I put a brand new battery in about 1 month ago.
I have not driven it for a couple of weeks.
Yesterday, I started it up, started just fine, but then I turned it back off in about 30 seconds, because I had forgotten to take care of something in the house.
About 1-1/2 hours later, I came back out to start it, and it is completely dead.
No power to anything. The dome light doesn't even come on.
I thought that was really really strange, seeing that it had started just fine earlier.
I hooked up a jump starter to the car and let it sit for a bit.
This will usually at least turn the dome light on, but this time, nothing.
It is like something has come loose, or a fuse somewhere has blown or something.
I did check the fuses under the hood with a multimeter, and they appear fine. I also checked the battery cables, and they are good and tight.
Any ideas on what else to check?

 

http://www.wikihow.com/Find-a-Parasitic-Battery-Drain

It sounds like something is draining the battery, or the alternator isn't charging it up enough.

 

No... It sounds like a grounding or connection issue. He mentioned that he hooked it up to a charger, and the dome light didn't come back on there either. So it's NOT parasitic power drain...

I would follow the wires and see if any are disconnected or corroded.