[typoon]

http://www.batteryuniversity.com/parttwo-34.htm

Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.)
Short battery life in a laptop is mainly caused by heat rather than charge/discharge patterns.
Although memory-free, apply a deliberate full discharge once every 30 charges to calibrate batteries with fuel gauge. Running down the battery in the equipment does this. If ignored, the fuel gauge will become increasingly less accurate. The battery life will not be affected.

Keep the lithium-ion battery cool. Avoid a hot car. For prolonged storage, keep the battery at a 40% charge level.

Consider removing the battery from a laptop when running on fixed power. (Some laptop manufacturers are concerned about dust and moisture accumulating inside the battery casing.)

Avoid purchasing spare lithium-ion batteries for later use. Observe manufacturing date. Do not buy old stock, even if sold at clearance prices.

[toshigen]

I read a similar article a few months ago (can't remember where), and stopped fully discharging the lithium ion battery in my Pismo like I had been doing for 3+ years.

That's the kind of thing that should be included in the manual that comes with Powerbooks...

Then again, maybe it was in the manual and I was just so excited to have a new Powerbook that I skipped over that part.

[SEkker]

My Pismo came with a manual?