My MBP swtich off when the battery is still 80% full

Since the last battery update we got this october for the mbp 15" my battery isnt functionning normally.
Now if i turn on my mbp with a fully charged battery i have about 1h30 min-2h00 of time remaining..
But after about 10-20 min my mbp turns off with no warning. and if i check my battery with the button on it i still have 3 green lights on 5.
What can i do to repair that ??
I have waited untill leopard.. But nothing has changed..
Message was edited by: Emmanuel Sotto

You can try resetting the SMC, and if that does not fix it, contact AppleCare.
Apple has acknowledged problems with notebook batteries and extended the battery warranty to *two years* for CD MBPs. Read this page for details:
http://www.apple.com/support/macbook_macbookpro/batteryupdate/
Hope this helps...

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