Battery Problem, MacBookPro

1. Jean Guillaume Pyraksos - 11 August 2007

   Behavior is the following.
   I work with the battery connected, at 99%.
   When I disconnect and work outside, very soon the
   computer shuts down as if the battery was low, even
   if it is at 70%. I need to reconnect the battery,
   which charges up to 99%.
   It is an Apple refurbished machine.
   Any hint ?
   Thanks,

   -JG

2. Mike Rosenberg - 11 August 2007

   Did you follow Apple's instructions when you first got the MacBook to calibrate the battery? If not, try that now.

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3. Jean Guillaume Pyraksos - 11 August 2007

   I did not. Now, it does not work as the battery shuts down very quickly. Should I reset the PMU ? Can it hurt ?

   -JG

4. nospam - 11 August 2007

   if the machine suddenly shuts down when the battery has a 70% charge, then the battery most likely has a failed internal cell which caused the whole battery pack to drop below the necessary voltage to run the computer.

   if it is under warranty (and refurbished ones have a full one year), then get it replaced. otherwise, you'll need to buy a new battery.