What Do the Four Battery LEDs on My Dual USB iBook Mean?

I am struggling with some battery problems, but I'll not bore you with those travails right now. Instead, I have a simple question:
What is the significance of the LEDs and the button on the bottom of my iBook battery?
I have searched the web and the Apple website, but I can't find any documentation about these battery features.
Thanks in advance.

Have you tried the battery calibration suggested by Dennis Marsden when he linked to the Apple Knowledge Base article on the procedure?
http://docs.info.apple.com/article.html?artnum=86284
Have you tried resetting the PMU? The PMU (Power Management Unit) controls the charging function, so resetting it may help.
If neither of these procedures helps, chances are you need a new battery. The Washington Post reports that the typical lifespan of a lithium-ion battery is two to three years, whether it is used or not. You may be seeing symptoms of a battery at the end of its lifespan.

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http://eshop.macsales.com/shop/powerbook/battery/ibook-g3-g4-12inch/

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What Do the Four Battery LEDs on My Dual USB iBook Mean?

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