LED lights issue / battery problems

Sorry if this has been asked before, I looked in some old threads but didn't find an answer...
When I plug the MagSafe adapter into my computer, the LED lights up for 2 secs when I plug it in and then goes out. I seem to be using my battery power.
But if I take the battery out, then the LED becomes green again and it is powered by the adapter once again.
I followed a troubleshooting article but no luck? Can someone explain what is going on here?

Follow Rod's link to the "[how to clean the MagSafe connector|http://docs.info.apple.com/article.html?artnum=303240]" tech article and make sure both the plug on the cable as well as the connector on the Mac are perfectly clean and debris-free. My connector tends to pick up lint from God-knows-where and after awhile the plug does not seat completely in, after which I start getting the blinking lights; a good cleaning has always restored functionality. If that doesn't remedy the problem, you will probably need Apple support.
In order to know for sure if it is charging, you may want to open System Preferences, select Energy Saver, go to the Options tab and tick the "Show battery status on the menu bar" option. That way you can see what's going on at all times with the icon on the menubar.

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