For some time I'm also experiencing some problems with my MBP battery. The MBP is form summer 2007 and so the battery is only 1.5 years old. When the battery is fully charged and I unplug the charger and continue workin before then in 10/15 minutes without any warning it goes of completely, no sleepmode or anything. Trying to switch it on again on battery power only lasts for 20 seconds. After connecting the charger the battery has 0% left. I must admit that most of the times I use the MBP while connected to the charger, it shouldn't matter does it? Anybody else experiencing the same problems with the mid 2007 MBP battery?