2 entries tagged ‘battery’ were posted to The Empty Set Ø since Feb 2000.
An Apple KnowledgeBase article discusses battery calibration for PowerBooks and iBooks.
A lithium-ion battery provides 300 to 500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery.
Just that you know: not all entries were successfully recovered. It appears that I have lost some 300 posts in the update/migration process. Sorry about that.