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
"We all have private ails. The troublemakers are they who need public cures for their private ails." - Eric Hoffer