I bought a new battery for my iBook a while back, but kept the old because it still kept a pretty decent charge and I thought it might be useful at some point. Anyway, it's just been sitting around this whole time, so I've decided to try and sell it to someone who needs it.
It's a 2001 battery, model number M8403, assembled in Taiwan. I've tested the battery, and it'll hold a full hour under pretty normal usage, half an hour under more demanding usage. I describe my testing below.
The battery did a good full hour on normal settings, without display or CPU sleep, running a normal screensaver. It held half an hour charge while running BOINC on "highest" processor setting and no (display or computer) sleep, with the display on midway brightness.
I'm asking $15 SHIPPED