Laptop not used in over a year, bad battery?

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

  1. yabot macrumors regular

    Jun 26, 2013
    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

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

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


    Jun 2, 2016
    Cornwall UK
    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

    Jun 26, 2013
    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

    Jun 2, 2008

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