The iBook's battery suddenly started draining a full charge in just an hour. It worsened until I was lucky to get more than 30 minutes from it, which is just about the same as having no battery at all. "Oh, those are only good for a few hundred charging cycles," someone said. RIP my laptop battery, 2001-2003.
So I got the a new battery in the mail yesterday. It's the wrong model ("snow" instead of "crystal" -- Apple imitates L.L. Bean catalog), but it seems to work fine. 3.5 hours on a charge!