PB shuts down between 30% and 50% battery life

Hello everyone,
My 15-inch PowerBook is around 18 months old. When I first got it I calibrated the battery. I do have it plugged in a lot, but I also use it on battery a lot.
In the past few weeks, my PB has been shutting down when I have been using it with the battery. As recently as a month ago, I would get the alert message (anywhere from 8%-12% left) telling me I was almost out of battery life.
Now, it just shuts down when it is between 30% and 50%. No warning, no alert, nothing. And of course I lose anything open that was not saved. I tried the PMU reset a few times but it does not seem to make a difference.
Any advice?
Thanks in advance! =)

count me in also. powerbook g4 fw400.
been like this with 10.2 --> 10.3 --> now 10.4
clean installs on everyone one. So I'm sure it isn't a software issue with the OS. Anyone try the new Battery Update 1.1 with our older powerbooks?
http://www.apple.com/support/downloads/batteryupdate.html

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PB shuts down between 30% and 50% battery life

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