I just got a replacement battery for my late 08 MBP. THe last one was draining very, very fast. So I charged it to 100%, let it drain until it went to sleep... but now I'm supposed to leave it off for five hours, and I need to use the computer! I took the battery out (after trying to turn it off using the power button) and connected the power cable, and expected it to start up from scratch, but I instead saw the 'coming out of hibernation' thing happening. 1. Does the computer hold a little bit of charge somewhere other than the battery? How else could it manage to not shut down completely when I took the battery out? 2. Is it all right to use the computer for the next five ours with battery out, or does it need to 'rest' in the computer for that time in order to calibrate properly? Thanks!