I have a Lenovo T510, and it spends 90% of the time sitting here on a desk connected to A/C waiting for me to go on a trip. I have done this for years - I totally remove the battery and store it in a cool, dry place, ideally at about 50% charge. It lasts and lasts and lasts that way.
CorkyG - Tucson, AZ
"Ineptocracy- a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers." - Merritt Man, 2011