I know that the battery "memory effect" should not affect Li-Ion power cells, but my PB went literally overnight from giving around 2-3 hours of use to only 50 minutes. Basically it's what I'd expect from a Ni-Cad or Ni-Mh cell. I must confess that I neglected to ever exersise the battery and am the type of person who mostly uses the PB when it's plugged in. Anyone else had this problem and are there any recommendations or do I have to spring the $120 for a new battery? Perhaps ironically I am now on reserve power and have to click submit before it goes to sleep.