Battery Meter out of Sync - How can I resolve?

Hi,
I have a 3.5 Year old MAC Book Pro.
As soon as the battery gets to 20% (acccording to OSX) it just cuts all power and everything is lost. The battery is dead, not sure why OSX reports 20% before it turns off.
I've read some tips on recalibrating but I can't do that as it requires you to wait until the low battery warning kicks in.
Some people say a sudden power cut is due to overheating. This is not the case with me, as the battery is totally dead and needs AC Power to come back on. Also it happens whenever I get to 20% even if I shut down at 22% leave for hours so stone cold and power up for a few mins.
Some other articles say replace the battery, ok it's 3.5 years old but battery apps say its 96.1% healthy and it lasts hours.
Bascially I need to override when the low battery warning comes up? Is this possible?
Look forward to replies
Louis

Open System Profiler>Hardware>Power>Battery Information and post this from your MBP:
Also try a SMC reset:
http://support.apple.com/kb/HT3964
Ciao.
Message was edited by: OGELTHORPE

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