Hi, Check out this article http://www.apple.com/batteries/notebooks.html Apple recommends charging and discharging a notebook's battery at least once per month. And, while memory effects in modern batteries are much reduced from what they were a few years ago, you will still suffer a loss in the charge a battery will hold if it is not completely drained first, resulting in a shorter battery life. Hope this helps. On 2/13/05 11:23 AM, "Germain" <affaires at vif.com> wrote: > I take off the battery in order not to > stress it by continuous charging