Not that I'm complaining, but my PB battery seems to get a longer run time the longer I've had the PB. Is this possible? I'm slightly over 4 hours now, I was getting 3 hours and 45 minutes. I just recently re-enabled bluetooth as well. I've noticed that my iPod battery seems to dissipate energy without use. I charged it a week ago and have not turned it on. It lost 1/5 of the charge power in one week. Is this normal?