Troubleshooting (pulled) Mac OS X 10.2.8: Re-calibrating the battery

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from http://www.macfixit.com/

Troubleshooting (pulled) Mac OS X 10.2.8: Re-calibrating the battery

Re-calibrating the battery As we continue to cover the phenomenon of 
drained PowerBook batteries after the pulled Mac OS X 10.2.8 update, 
it appears that some users have had success "calibrating" their 
batteries - generally those who simply have a bad battery indication, 
not those whose batteries have actually declined in capacity.

Apple Knowledge Base article #86284

http://docs.info.apple.com/article.html?artnum=86284

explains "The Lithium Ion battery of an iBook or PowerBook computer 
has an internal microprocessor that provides an estimate of the 
amount of energy in the battery during charging and discharging. The 
battery needs to be re-calibrated from time to time to keep the 
onscreen battery time and percent display accurate. You should 
perform this procedure when you first use your computer and then 
every few months thereafter."

The procedure for re-calibrating is to first fully charge your 
PowerBook, then disconnect it from the external power source and run 
it until there is no power left (the machine goes to sleep). Then 
connect the adapter and full recharge.