8 Replies Latest reply: May 5, 2012 12:55 AM by hrtg
hrtg Level 1 Level 1 (0 points)

My unibody 17" MacBook Pro occasionally shuts down on waking from sleep when it isn't plugged in.


When I open the lid to wake it I can hear the hard drive and fans starting to spool, and then the next second it's off and silent. The laptop doesn't mind being turned on again after it does this and might go a week without doing it again, equally it might do it next time I try and wake it from sleep. It does this regardless of battery charge level.


coconutBattery says the battery still has 86% of its designed capacity, and I haven't noticed anything else untoward regarding battery charging or performance when in use.


So my question is two fold:


1) Does it sound like the battery's internal processor is malfunctioning, or could it be something else?

2) If it is the battery's internal processor, will replacing the battery replace the processor, or are they fitted separately (in defference to the 'internal' part of its name)?







nb. just in case it makes any difference, the laptop is a 17" Mid-2009 MacBook Pro, 2.8GHz Core 2 Duo with 4Gb Ram running OSX 10.7.3

MacBook Pro, Mac OS X (10.7.3), 17" MBP, Mid-2009 Unibody