Computer shuts down randomly; Battery goes flat from 1:30h to 0 in 1min

I have a strange behaviour on my laptop;
I fully charge the battery and then disconnect from power plug.
Checking the battery both through Battery icon as well as pressing the button on the battery itself shows that it was more than half full.
Within 2 minutes the battery goes from half full to a shut down and can only be revived through connecting the power cord again.
Anyone having seen this and any solutions out here
thx J

Your battery has unfortunately gone bad. After a long while these batteries can be mischarged so that even though there is only a small amount of battery power it reads as full and there is no way to fix this that I know of. Its a fact of life with most laptops out there.
If you have not tried it, to be sure, you can reset your power management and let the battery charge back up and see if it any better.
Info on Battery Calibration: http://docs.info.apple.com/article.html?artnum=86284
Info on resetting Power Management:
http://docs.info.apple.com/article.html?artnum=14449

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