Leave the battery on the laptop when using AC power. It will stay float charged that way, always ready for use when you need to go portable, away from the AC line.

Lithium-ion battery technology will allow that without fear of overcharging, etc.

That said, it is a good idea to "excercise" your laptop battery occasionally, maybe once a month, by disconnecting the AC and letting the laptop run off of the battery, disharging it and then when it is about 75% discharged or so, re-connect to AC and let the battery fully charge again. This little bit of excercise can help to extend the battery life a bit. These new technology LI-ion battery packs and ghe charging circuits built into today's laptops don't need a lot of babysitting.


--Mac