History: I have a 2000 Dodge Durango 4.7L that I just got from a> dealer about a week ago. Before I bought it from the dealer, they said> that they had to replace the fuel injectors because one of them was> stuck open. After that, they said that the problem ended up being a> faulty ground and they fixed it also. I took it for a test drive right> after they fixed everything and while I was sitting in the parking lot> talking to my wife before we took it for a drive, it started idling> rough. We went on the test drive and everything seemed fine. I talked> with their mechanic when we got back and he said the rough idle was> probably due to them just replacing the fuel injectors. I turned it> off and let if sit for awhile and then took it for another test drive.> It ran fine. We came back a week later, test drove it and it ran> perfect, and we bought it. Today, I upgraded my speakers. I had the> radio on while I was putting the new speakers in and had the doors open> the whole time. When I got done, the battery was pretty low and when I> tried to start it, it had a hard time turning over but it did catch and> start. I left it running for a while, with the doors still open. I> went inside my house for about 15 minutes and when I came back out the> engine had stopped.>

Is it possible that the battery does not have enough charge to keep the> motor running? I thought once the motor had started the battery could> be removed and the vehicle would continue to run. Am I wrong? Could> it be the battery? (I HOPE!!!) Any advice will be greatly appreciat