i was surfing without my powerbook tonight, yes i still haven’t gotten it back from apple. anyhow, i came across a posting on the apple forums detailing how to properly calibrate your battery. i’ve run into problems similar to what was posted in this thread. for example a few times my laptop battery would get to 30% life and then the machine would instantly go to sleep. i also found myself losing battery life fairly quickly. this writeup makes perfect sense and judging by the number of responses it appears that others are seeing success following this new method. i’ll indeed give it a try when i get my machine back, any day now me thinks.