You might want to reset the PMU (power manager) You can go to Apple support to get the info on how to do it,or just google "Clamshell IBook PMU reset". Hope this helps!
From Apple "Battery Verification
When the power adapter is being used, the ring around the power adapter port glows green when the battery is fully charged. The ring glows amber if the battery is being charged.
You can also check the battery status by looking at the Battery portion of the control strip or the battery symbol in the upper right corner of the Finder menu bar.
Power Adapter Verification
Try using a known-good power adapter if the computer cannot run off the existing one, or try the existing power adapter with another iBook or G3 Series PowerBook
Under normal operation, the ring around the power adapter port will glow green or amber if the computer is receiving adequate power.
Power Manager Reset
±Warning: Resetting the power manager permanently erases and removes a RAM disk. Resetting the power manager also resets the date and time.
iBook computers have a reset button on the keyboard above the power button. Press the button once with a paper clip to reset the power manager. Make sure the button clears the plastic of the top case when you release it, and is not stuck in the down position."