Shuts down after disconnecting power cord

computer shuts down about two seconds after power cord is disconected, and i'm not able to fire it up when id only on battery...
status on the battery says it's 100 % (fully charged)....
on power cord works just fine...
i don't think it's a baterry issue, i think it might be a software?????

Hi KW305,
welcome to macbook forum.
Try reset your SMC / PRAM:
http://docs.info.apple.com/article.html?artnum=303319
http://docs.info.apple.com/article.html?artnum=2238
Install battery updater:
http://www.apple.com/support/downloads/batteryupdate12.html
Calibrate your battery:
http://docs.info.apple.com/article.html?artnum=86284
And repair permission:
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh12.html
IF the problem persist, consult apple
Good Luck.

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