Your iBook may not be correctly displaying the charging info. Try resetting the PMU (power managment unit)
Warning- Doing so will remove all ram disks.
If you have a clamshell iBook-
Turn the computer off and remove the battery
Press the reset button
Wait 5 secs
Replace the battery and turn on the computer
If you have a white dual usb iBook WITH A RESET BUTTON ON THE LEFT SIDE (very important, check if you're not sure.)-
Turn off the computer
remove the battery
press the reset button
wait 5 secs
replace the battery and turn on the computer
If you have a white iBook with 16mb Vram without a reset button and/or have an ibook with a 14.1 inch display-
Turn off the computer and remove the battery
press these keys being sure to not press the function (fn) key
Shift, control, option, power
Replace the battery and restart the computer.
Hope this helps!
=ajmbc=