Can you recommend a battery meter?
I have successfully installed the xfce-power-manager however there is an 'x' next to the icon in the panel.
I have since found the 'battery monitor' in the panel settings. Hovering over it shows "No battery found".
There is a battery installed, and the PowerBook runs off battery successfully (I have used the lights on the battery to determine the level of charge).
Thank you, this, too, has worked!