MacBook Pro says "Power Adapter" when running on Battery Power

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i've got 2010 macbook pro, (13" 2.4 ghz c2d), running snow leopard, , noticed when taking unplugging , using around house, battery manubar doesn't change. still shows being plugged in, , when click on it, says: "battery if charged; battery source: power adapter"

strange, since i've been using on 4 hours unplugged... i'd love think apple figured out miniature perpetual motion generator laptops, somehow think that's not case. ideas?
 

restart mac.

reset smc , pram/nvram:

http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379
 


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