Power and battery problems with MacBook Pro intel core duo

Hi there, I've been having this problem for about a week now with my macbook pro where it shuts down a second after it's unplugged, even though the battery is full. I tested the power cord with another that works, and the same thing still happens. I've zapped the p-ram, and reset the MPU where you take out the battery and hold down the power button for 5 seconds and all that. I think it might be the logic board, or something within that? Any suggestions before I send it in to Apple for investigations?

I started having the same problem several days ago. Unplug the magsafe connector, and the MBP powers suddenly powers off, even though the battery shows a full charge on both the menu bar and the battery leds.
I decided to try a new battery after reading a number of posts here about the same problem.
Back to normal with the new battery. So now I'll go back to Apple to get the non-functioning battery replaced under AppleCare. (I wanted a second battery anyways)
Hope this helps.

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