I'm a proud new owner of my first Powerbook. Its the combo 12" 1Ghz w/512 mb ram upgrade. How long should the battery last? Mine says 2:15, I've let it gone down to 0-1% and then charged it up, but I only get around 2:15. I've turned off Bluetooth which the help file suggests. It's on Automatic, i've switched the settings and the time/percentage doesn't seem to change. Any comments are welcome.