Try optimizing your battery following these
instructions:
http://www.apple.com/batteries/
Thank you. Sorry that I failed to mention that I did do the battery calibration procedure with this battery after receiving it. I suppose I could do it again, but I seem to recall it wasn't suggested as being needed even as infrequently as each month if the computer is kept busy every day. Mine certainly is. Am I wrong?
On the page you referenced it says Apple doesnt recommend leaving the laptop plugged in, that it's best to "keep the electrons moving." I'd really be interested to know if MBP owners are actually doing this, i.e. running on battery whenever possible, even when in the office or otherwise near a handy AC source.