MacBook dies doesn't "sleep" when battery is low.

When my battery is drained to about 10% of power, my MacBook "dies" instead of going into "sleep mode". When I plug it back in, I have to reboot.
Somebody suggested to reset the SMC <http://docs.info.apple.com/article.html?artnum=303319> ,and to calibrate the battery. I tried but I don't think it worked.
After resetting the SMC I tried to calibrate, but when the MacBook was still showing 10% of power it shut down. After a few minutes, without plugging the adapter, I turned it on again and it lasted 3 more minutes and shut down again.
Then I just left it off for five hours and I'm charging it now.
Any ideas on how to solve this problem? Is this a battery problem, or a computer problem?
MacBook   Mac OS X (10.4.9)  

Alfonso
Be sure you've installed the battery update and...
Check out this page regarding known battrey problems.
http://www.apple.com/support/macbook_macbookpro/batteryupdate/
Jim
PowerBook G3 500 Mhz "Pismo"/ 2.0Ghz BlackBook 2GB OWC RAM   Mac OS X (10.4.9)  

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