Magsafe and Battery issue

Hi there, I'm having a bit of a problem with my MacBook 2009. The exact model number is A1342, if that helps.
I originally bought it used online, and have been having issues since day one. It worked normally when I first plugged it in, then I unplugged it and went somewhere else for a bit. When I went to go plug it back in, the Magsafe cable showed a very dim orange light, and then it turned off completely, and the battery status at the top showed that it wasn't being charged. It also showed a little triangle icon, and said that the battery would need to be serviced soon.
Well, I did some research online, and even check the warranty status. I figured since it was expired, and I had paid so little for it, there was no issue in trying some self repair. I quickly found which cable connected to the main board, unplugged it, waited a few moments, then plugged it back in. Suddenly, the Magsafe would start working again! Until I unplugged it and plugged it back in, that is.
So, after a bit of leaving it sit, I was able to obtain a used, but working battery from a friend whose Macbook (The same model) decided it wanted to stop working. I plugged in the battery without removing the old one, and it worked well, so I plugged in the Magsafe cable, and the little orange light turns on briefly, then shuts off again right away.
Through all of this, I tried with the battery unplugged, and only the Magsafe running the computer, and it works perfectly fine! Green light and all! Plus, the Magsafe seems to work on other computers without an issue.
So, could it just be the battery? Or might it be something else? I've never had a problem with a Macbook before, so this is certainly a bit weird! Thanks in advance for your help!

Your battery looks pretty healthy to me. There is the possibility that the capacity will suddenly decrease though. With the capacity numbers you have, the battery should work fine for about 3 hours. I'm not sure a new battery will help with your issue.
If you disconnect the MagSafe adapter, does the computer shut off immediately? Do you have the battery status displayed in the menu bar? If so, what does it say?
Try resetting the SMC to see if that helps any:
http://support.apple.com/kb/HT1411
~Lyssa

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