When using a notebook computer running from fixed line power over extended periods, the battery shld be removed and stored in a cool place so that it is not affected by the heat produced by the computer. have to use it once i a while though,it will degrade over time even if left in storage
Follow this link in extending the life of ur laptop's battery http://forums.cnet.com/5208-7587_102-0.html?threadID=334505&start=15