MacBook Pro won't turn on if the AC (adaptator) is not plugged in...

My MacBook Pro refuses to tun of by itself (with only the battery), i need to plug in the AC to do so... any suggestion ? It's a 2009 13" MBP, indeed the battery is getting weak but it works...

You battery may be in its death throes.  try a SMC reset first:
http://support.apple.com/kb/HT3964
If no change, post from System Profiler>Hardware>Power>Battery Information the following:
Ciao.

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    Try here >  Troubleshooting: My computer won't turn on
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    You need to hit the "reply" button on post to whom your responding too, it's hard to tell if your responding to me or someone else.
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    What's store in PRAM   https://support.apple.com/kb/HT1242
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    Run through this list of fixes
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    Download and install Mac OS X 10.6.8 Update Combo v1.1.

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    Mac OS X: Gray screen appears during startup 

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