Battery health after 3 monts

Discussion in 'MacBook Pro' started by sangui2, Oct 21, 2018.

  1. sangui2 macrumors newbie

    Joined:
    Aug 5, 2018
    #1
    I using my MBP 2018 since end of July.
    It is rather normal usage - some work on battery, some on charging.

    At this moment I have 26 cycles, but this is how it looks in battery monitor:

    Screenshot 2018-10-21 at 18.58.20.png
    Why I can see 100% if there is only 6881/7200 mAh charged?
    Also it is possible that in only 3 months battery Original Max drop down from 7336 to 7200 mAh?

    Sorry for strange questions but this is my first Mac and I want to be sure that everything is fine.
     
  2. iMacDragon macrumors 68000

    iMacDragon

    Joined:
    Oct 18, 2008
    Location:
    UK
    #2
    Pretty typical, a) most OS's show 100% for the first 5% or so of battery charge, because people in general would be 'unhappy' it only showed 100% for a few seconds when they start using device.
    b) a few percent drop during first months is very usual, it's just how batteries are. Mines already lower than that and I've only had it from september. ( 7164 max )
     
  3. sangui2 thread starter macrumors newbie

    Joined:
    Aug 5, 2018
    #3
    Thank you for explanation.
    Do you have MBP 2018?
    Well, right now I have 6873/7200 it is still difference.
    Why this pointer does not go upper?
     
  4. iMacDragon macrumors 68000

    iMacDragon

    Joined:
    Oct 18, 2008
    Location:
    UK
    #4
    It's not charging at this moment to help preserve the battery. It's not good to contininually keep battery on charge, so the battery management lets it drop a bit before it will start charging again. If you unplug/replug power cable it will probably start the charge cycle again, but I wouldn't do this unless you want it to be truly at 100% for some reason.
     
  5. sangui2 thread starter macrumors newbie

    Joined:
    Aug 5, 2018
    #5
    It make sense.
    My only worry is the 2% drop capacity in only 3 months.
    You have similar capacity, yes?
    Can you check in some battery health app?
    Anyway, how many cycles you have right now?
     
  6. iMacDragon macrumors 68000

    iMacDragon

    Joined:
    Oct 18, 2008
    Location:
    UK
    #6
    About the same, and it really is very normal. It's a subject that comes up frequently, battery degredation is not linear, the fact it's lost 2% in 3 months does not in any way imply it will have lost 8% in 12.

    Measuring battery capacity in itself is an imperfect science, the figure is more the systems attempt to track battery charge/discharge rather than an exact true value, too.

    Only way to know true battery capacity is to run a complete discharge/recharge cycle whilst measuring charge/discharge power usage, really, everything else is an estimate.
     

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5 October 21, 2018