Battery Replacement for MacBook Air

Discussion in 'MacBook Air' started by gizzzo, Sep 22, 2016.


What battery replacement did I get?

  1. You got legit. This is normal.

  2. You got a lemon.

  1. gizzzo macrumors newbie

    Apr 30, 2009
    The battery of my MacBook Air (13-inch, Mid 2013) that I bought last 2013 has been draining fast that I felt the need to replace it. So I contacted a local Mac repair guy and he said he would be able to replace it with a brand new battery from what he claims to be the same manufacturer's.

    I checked the battery specs and it seems legit. Manufacturer and Serial numbers seem to be ok. Cycle when I got this = 0.


    Accdg to specs a new MacBook Air 13-in mid 2013 should have 12 hours of battery life. That's at a rate of 100%/12 = 8.3% drain per hour. But when I measured my battery it's draining at a rate of 22%/hour!

    Battery age, accdg to Battery Health App, is 2.2 years. On one hand this could be reasonable since it was manufactured 2.2 years ago but not used, hence cycle = 0.

    Or did I get a lemon?


    See specs below
    Battery Information:
    Serial Number: D8620920854DKRNAG
    Manufacturer: SMP
    Device Name: bq20z45
    Pack Lot Code: 0
    PCB Lot Code: 0
    Firmware Version: 406
    Hardware Revision: 000a
    Cell Revision: 162
    Charge Information:
    Charge Remaining (mAh): 4138
    Fully Charged: No
    Charging: No
    Full Charge Capacity (mAh): 6374
    Health Information:
    Cycle Count: 8
    Condition: Normal
    Battery Installed: Yes
    Amperage (mA): -971
    Voltage (mV): 7765


    Please note that cycle count = 8 because I have made 8 recharges since I got this replacement.
  2. tubeexperience macrumors 68040

    Feb 17, 2016
    batteries degrade even when they are not used

    of cause, battery draining per hour depends on how the computer is being used.
  3. kiwipeso1 Suspended


    Sep 17, 2001
    Wellington, New Zealand
    Try using lower brightness on battery, along with contrast settings. (On the function keys.)
    Additionally, your best battery usage is on battery just a few times a month.
  4. gizzzo thread starter macrumors newbie

    Apr 30, 2009
    Thanks that make sense
    --- Post Merged, Sep 27, 2016 ---
    Well I'm using it as specified in specs from apple website which says "Up to 12 hours wireless web"
    --- Post Merged, Sep 27, 2016 ---
    Thanks but sorry what do you mean by this?
  5. Brian Y macrumors 68040

    Oct 21, 2012
    I'd say you got a lemon.

    Battery capacity on 2012-15 13" Airs is 7150 mAh, yours is 11% less out of the box. Official batteries are rated to hold 80% after 1000 cycles.

    Do you have a pentalobe screwdriver? If you post a photo of the battery we'll tell straight away.

    Edit: googling the battery serial brought this up:

    Either it's a cloned serial, or the repair place has bought "returned" batteries.
  6. kiwipeso1 Suspended


    Sep 17, 2001
    Wellington, New Zealand
    The recommended battery usage is on average a full battery drain, then recharge cycle once a week, with the rest of the time on charge. The least useful way of using your MBA is to run it constantly on charge, as the battery will die quicker.
    The bad way to handle it is to let it partially drain, then charge back daily, as you will ruin your battery with lower capacity quicker.
  7. hellopupy macrumors 6502


    Sep 8, 2016
    Los Angeles
    I have a feeling you might've gotten a lemon.

    I'm on 700 cycles already and even though I don't feel like I get as long as duration as when I first got it I think that might just be because I am so used to not having to charge it for a long time. I can watch videos in bed unplugged for hours while having at least 10 draining tabs opened on Safari.

    3+ years and over 700 cycles and only down 712mAh? I'm no expert but I think thats pretty good.

  8. cbdilger macrumors newbie

    Oct 15, 2013
    West Lafayette, IN
    Lemon. A battery which is not well cared for will degrade even faster — high temperatures are especially bad. Perhaps that happened to yours. My 2013 MBA 6,2 still has 6400 mAh after 450 cycles.

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7 September 22, 2016