Laptop not used in over a year, bad battery?

Discussion in 'MacBook Pro' started by yabot, Nov 30, 2016.

  1. yabot macrumors regular

    Joined:
    Jun 26, 2013
    #1
    Hi guys,

    I went travelling September 2015 and returned a few days ago. I thought that when i lifted the lid on my early 2013 15 retina mbp i'd be dead as dead could be, however it turned on with 40% charge?! However since using it the last couple of days the battery has been really crap, like i mean it barely lasts 2 hours, my dad reckons its just because it hasnt been used in a while, and needs charging and draining a few times....?battery health yesterday was at 75% and 775 cycles, today battery health is at 85%.

    Do i need a new battery or should it 'get better',

    cheers guys.
     
  2. Samuelsan2001 macrumors 604

    Joined:
    Oct 24, 2013
    #2
    No way they know that mate you might get lucky you might not.
     
  3. TheRealAlex macrumors 65816

    Joined:
    Sep 2, 2015
    #3
    Lithium Ion chemically degrades over time so what was once 100% eventually becomes 85%
     
  4. elf69 macrumors 68020

    elf69

    Joined:
    Jun 2, 2016
    Location:
    Cornwall UK
    #4
    If been stored for a while I would give it 2-3 charge cycles then see if it recovers runtime.

    Year is quite a while for a battery to be dormant.

    my 2009 macbook has 92% health with 391 cycles.
    But is used everyday and was by last owner too.
     
  5. yabot thread starter macrumors regular

    Joined:
    Jun 26, 2013
    #5
    thanks for the reponses. any idea how much it costs to replace and how long it takes? i might do it myself and get the parts from ifixit if its really expensive.
     
  6. AlanShutko macrumors 6502a

    Joined:
    Jun 2, 2008

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