Battery degrading too quickly in 2017 rMB

Discussion in 'MacBook' started by astro01, Sep 13, 2018.

  1. astro01 macrumors newbie

    Joined:
    Sep 13, 2018
    #1
    I bought a 2017 retina Macbook this past June, from the refurb store. It is the i7/16gb Ram/512 gb SSD model. I installed Coconut battery to monitor the state of my battery shortly after buying it.

    At 5 charging cycles, my battery capacity was rated at 97%. Now my macbook is up to 35 charging cycles, and Coconut Battery says the charge capacity is 94%. This to me seems low for so few charging cycles. I know Apple says batteries need replacement when they are below 80% capacity, and if my battery continues to degrade at this rate I will reach that threshold in less than a year. Is this normal?

    I allowed the battery to go to 0% charge twice in the first couple of days, followed by charging it to 100% charge so that the internal charge monitor could be calibrated. Since then, I have recharged the battery fully whenever the charge gets to about 65%.

    Am I doing something wrong or is it normal for battery capacity to already be at 94%?
     
  2. chabig macrumors 603

    Joined:
    Sep 6, 2002
    #2
    You cannot predict how the battery will age by extrapolating. Your battery is most likely normal.
     
  3. NT1440 macrumors G5

    NT1440

    Joined:
    May 18, 2008
  4. astro01 thread starter macrumors newbie

    Joined:
    Sep 13, 2018
    #4
    Thanks for the replies.

    I am now at 45 cycles and battery is at 93% according to Coconut battery. Still seemed low, so I checked the graphs on Coconut Battery Online:

    https://www.coconut-flavour.com/ccbonline/index.php?bid=ac57cf4f4e4c1a1f1835ea8b8ea641df

    Seems to be a little bit below average compared to similar 2017 Macbooks, but not too much. I will keep checking my battery health, and I am seriously considering getting Applecare before my 1 year warranty expires, since the cost is about the same as an out-of-warranty battery replacement from Apple.
     
  5. fokmik macrumors 68040

    Joined:
    Oct 28, 2016
    Location:
    USA
    #5
    We have 2 Mb 2017 and the coconut battery very often is not accurate
    After 2 months of use and around 60 cycles that app reported 91% and 93% , i went to the apple service, and with their proper tools, that battery life was at 99% and 100%
     
  6. astro01 thread starter macrumors newbie

    Joined:
    Sep 13, 2018
    #6
    That's very reassuring! Thanks
     
  7. BODYBUILDERPAUL macrumors 65816

    Joined:
    Feb 9, 2009
    #7
    DEFINITELY get AppleCare on a MacBook. It's worth the £220. These a beautiful machines BUT can cost A LOT of money to repair if something goes wrong. The warranty is great piece of mind!
     
  8. squadus macrumors newbie

    Joined:
    Sep 25, 2018
    Location:
    Cupertino
    #8
    I would just keep using it until it has problems and interrupts your work. Then I would take it into an Apple store for a closer look.
     
  9. astro01 thread starter macrumors newbie

    Joined:
    Sep 13, 2018
    #9
    I went ahead and got the applecare for the peace of mind. Besides the battery, I see on the forums that people have had other issues with things like the motherboard dying. I need my macbook to work for the next three years as I just started grad school, and I can't afford to buy a new one during that time!
     
  10. FilmIndustryGuy macrumors regular

    Joined:
    May 12, 2015
    Location:
    Manhattan Beach, CA
    #10
    Macbook 2017
    313 cycles
    88%

    it was at 87% for at least 60 cycles then went up to 88%

    I bought applecare+ so before it expiers in 1.5 years ill get apple to swap battery along with all internals since its all molded onto the same bottom plate and ill basically have a new macbook. Apple recently replaced the screen and top case. screen wobbled a bit and keyboard had sticky keys. so they have me all new aluminum since i kinda scrtched it by not using a case. I'm a no case guy and travel with this thing all over the usa. Apple care worth it. This is my favorite apple product.
     

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9 September 13, 2018