Faulty Battery or Normal Operation?

Discussion in 'MacBook Pro' started by lopexo, Aug 18, 2009.

  1. lopexo macrumors member

    Joined:
    Aug 18, 2009
    Location:
    Sacramento, CA
    #1
    Right after the normal "battery priming" I noticed this, but never bothered to ask or do anything about it.

    I use my late 2008 uni mbp mostly as a desktop replacement (external monitor/kb, etc.) and it is plugged into the outlet 98% of the time.

    I have noticed that when it is fully charged (100%) and I put it to sleep overnight, the next morning the battery shows (99%)...another day passes and it gets to (98%), another day and (97% and so on) till I unplug it and use it as a portable and let the battery get low before I plug it back again...

    The battery shows 100% health all the time and whatever the charge is left for the day....

    Is this normal for this batteries to loose a bit of charge every day when plugged in?

    Is it a defective battery? I'd like to hear from people that use their MBP in clamshell mode most of the time before calling apple care..

    thanks!!!
     
  2. Darth.Titan macrumors 68030

    Darth.Titan

    Joined:
    Oct 31, 2007
    Location:
    Austin, TX
    #2
    It's normal. Just discharge your battery past 90% to get it to recharge back to 100%

    It's a good idea to give the battery some use from time to time in any case.
     

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