New 13" Retina cycle count

Discussion in 'MacBook Pro' started by Macz0r, Nov 24, 2012.

  1. Macz0r macrumors newbie

    Joined:
    Nov 22, 2012
    #1
    So iv just bought a new 13" retina, and the battery cycle count says 3.

    Does this mean my new toy has previously been used? or possibly a repaired/resale?
     
  2. hackerwayne macrumors 6502a

    hackerwayne

    Joined:
    Feb 17, 2012
    Location:
    Kuala Lumpur, Malaysia
    #2
    Sealed box? 3 cycle counts seems normal. My Air shipped with 2 cycle counts.
     
  3. mfram macrumors 65816

    Joined:
    Jan 23, 2010
    Location:
    San Diego, CA USA
    #3
    There were probably some tests in there that counted to the cycle count. When I got my new rMBP, the cycle count on my battery was still 1.
     
  4. gorskiegangsta macrumors 65816

    gorskiegangsta

    Joined:
    Mar 13, 2011
    Location:
    Brooklyn, NY
    #4
    Not at all. A full calibration of the brand new battery takes up 2 cycles. Then, as the battery naturally drains below ~90% (or so) while it's shipped to you, the system counts one more cycle.
     
  5. Macz0r thread starter macrumors newbie

    Joined:
    Nov 22, 2012
    #5
    Wow, nice quick replies :) (new to this forum)

    Thanks, thats good to know ! Loving this little machine.
     
  6. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #6
    It's possible that your Mac was tested before shipping. It's nothing to worry about.
    The calibration process only takes one cycle, and the majority of Mac notebooks ship with zero cycles on the battery, even though they are all pre-calibrated. Draining below 90% does not count as a cycle. Read the WHAT IS A CYCLE? section of the following link for details on how cycles work.

    The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.
     
  7. gorskiegangsta macrumors 65816

    gorskiegangsta

    Joined:
    Mar 13, 2011
    Location:
    Brooklyn, NY
    #7
    A full factory discharge of the battery does sometimes register as 2 cycles. Sometimes, the batteries get off the manufacturing line with a charge cycle. Whether one gets a notebook battery with 0, 1, 2, or 3 cycles out of the box depends on the testing/approval process that particular batch of batteries went through before being inserted into finalized products.

    The ~90% figure wasn't supposed to be exact. To avoid microcharging (and thus unnecessary battery wear) the OS avoids recharging over a particular charge level, usually in the low 90's. Once the battery drains to the point where the OS feels comfortable to recharge it, and a user plugs it in to recharge it, that counts as one more cycle.
     
  8. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #8
    No, it doesn't. A cycle is a cycle. How they're counted does not change.
    That is not true. The short discharge protection prevents recharging when the battery is above 93%. Dropping below that threshold and recharging does not count as a cycle. Again, read the section of the Battery FAQ I suggested to understand what a cycle is and how they're counted.
     
  9. nyle macrumors newbie

    Joined:
    Dec 3, 2007
    #9
    BTO 15" rMBP arrived with 2 cycles count.

    Kept it plugged while in used then put it to sleep unplugged; next day battery was at 98%, used it on battery up to 85%, and then plugged it and cycle count went up to 3.

    It went 1 cycle count up without actually fully draining the battery.

    Is that normal? good or bad?
     
  10. Acronyc macrumors 6502a

    Joined:
    Jan 24, 2011
    #10
    My CTO 15" retina arrived with 3 cycles on it. It's been working fantastic and iStat is reporting it actually has more capacity than it is designed for (I doubt this is accurate, though). If it's just a few cycles I don't think that's anything to worry about. Actually, although this is pure conjecture, I would assume it might mean your battery has been tested more thoroughly, meaning your battery might have less chance of fault.

    If you read the "what is a cycle" section of the FAQ that GGJstudios linked to you will see that your battery does not have to completely drain for the cycle count to go up.
     
  11. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #11
    It sounds like you had already used up most of the 3rd cycle, so just the recharge from 85% was enough to go over the threshold and count another cycle. In other words, it didn't arrive with 2 cycles, but with something like 2.85 cycles. It will not count a full cycle if you only drain and recharge 15% of the battery.
     

Share This Page