I have a new battery that has only 3 or 4 cycles on it, that I got as a replacement a year ago. The battery and the machine it's in, a late 2008 MBP, has been sitting for the last year unused. I tried to boot it up today and it appears the battery is toast. OS X reports it as "Replace Now". I tried to charge it for a few hours but the machine shut off as soon as I unplugged it. Is there a way I resurrect this battery?
According to http://www.apple.com/batteries/notebooks.html:
So you are most probably out of luck.