"You are running on reserve power" error message

I am suddenly getting the error message "You are now running on reserve battery power" every time my PowerBook is unplugged, even with as much as 45% of the battery left. There is an article about this on the tech support web site, but it says it applies to system 10.2 (I am running 10.4.11) and it says it usually happens when wakening from an extended period of sleep, but for me it is happening every time I unplug the computer, even if it has been awake for a long period. At any rate, the article's suggested solution is to upgrade to 10.4, which is of no help to me. What could be causing this? I have been using this PowerBook since 10/05.

Thanks for your response. You're right, I do keep it plugged in a lot. After I get a new battery, what exactly do I need to do to do the monthly "deep discharge cycle"?
Make sure the battery is charged all the way, unplug the power adapter, and let it run until it shuts down. Lithium batteries need to be exercised like this periodically to maximize the ability to hold a charge. When you get a new battery, you may need to do this around 2-3 times in a row to get it to it's maximum capacity.

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