?New Battery drains too fast .. hmmm

Discussion in 'Mac Basics and Help' started by heshamsaeed, Feb 1, 2019.

  1. heshamsaeed macrumors newbie


    Sep 25, 2008
    Hello ...
    I recently bought an old used Macbook Pro; 2012 15", with Retina display, about one month ago
    On time of purchase, the battery cycle count was 1 . The seller told me it's a new battery.
    Other specs include:

    Processor Name: Intel Core i7
    Processor Speed: 2.3 GHz
    Number of Processors: 1
    Total Number of Cores: 4
    L2 Cache (per Core): 256 KB
    L3 Cache: 6 MB
    Memory: 8 GB

    Since I'm used to work on AC power, I didn't notice any problem. However, when I tried to test the battery, working unplugged, I noticed that the battery drains completely in 2 hours. Worse, I was monitoring the battery, and just noticed that the percentage goes down smoothly from 100% to 50%, then it drops suddenly to 46% then 19%
    The battery menu shows at the top : Service Battery

    Inspecting the battery it looked neat and clean. is it possible to reset the cycle count of an old battery (i.e. I was cheated)? Could it be a defective battery?

    A recent system report on the battery is shown below:
    Battery Information:

    Model Information:
    Serial Number: D86247331K3F9Y2AB
    Manufacturer: SMP
    Device Name: bq20z45
    Pack Lot Code: 0
    PCB Lot Code: 0
    Firmware Version: 511
    Hardware Revision: 000a
    Cell Revision: 1150
    Charge Information:
    Charge Remaining (mAh): 2022
    Fully Charged: No
    Charging: No
    Full Charge Capacity (mAh): 4851
    Health Information:
    Cycle Count: 7
    Condition: Service Battery
    Battery Installed: Yes
    Amperage (mA): -1836
    Voltage (mV): 10726

    System Power Settings:

    AC Power:
    System Sleep Timer (Minutes): 0
    Disk Sleep Timer (Minutes): 0
    Display Sleep Timer (Minutes): 0
    Wake on AC Change: No
    Wake on Clamshell Open: Yes
    Wake on LAN: Yes
    AutoPowerOff Delay: 28800
    AutoPowerOff Enabled: 1
    DarkWakeBackgroundTasks: 1
    Display Sleep Uses Dim: Yes
    GPUSwitch: 2
    Hibernate Mode: 3
    PrioritizeNetworkReachabilityOverSleep: 0
    Standby Delay: 4200
    Standby Enabled: 1
    Battery Power:
    System Sleep Timer (Minutes): 10
    Disk Sleep Timer (Minutes): 10
    Display Sleep Timer (Minutes): 2
    Wake on AC Change: No
    Wake on Clamshell Open: Yes
    AutoPowerOff Delay: 28800
    AutoPowerOff Enabled: 1
    Current Power Source: Yes
    DarkWakeBackgroundTasks: 0
    Display Sleep Uses Dim: Yes
    GPUSwitch: 2
    Hibernate Mode: 3
    Reduce Brightness: Yes
    Standby Delay: 4200
    Standby Enabled: 1
  2. MandiMac macrumors 6502a

    Feb 25, 2012
    Not quite sure about this one. Shouldn't a brand new MacBook battery for a 15-incher go well over 5500 mAh? My best guess here is that this is a replaced battery, yes, but neither an original one nor really built for this device...
  3. hobowankenobi macrumors 6502a

    Aug 27, 2015
    on the land line mr. smith.
    Could be a new battery....but a cheap, bad quality or defective battery. With modern batteries, sadly, we usually get what we pay for. As an example, here is a cheap replacement battery....with low reviews and similar issues to what you describe.

    Poor quality, or defective, you have little choice but to replace it. Hopefully with a good quality unit.
  4. chscag macrumors 68030


    Feb 17, 2008
    Fort Worth, Texas
    Apple no longer sells or replaces the battery for a 2012 MacBook Pro. So it's fairly obvious the seller replaced the battery with a low quality knock off unit. A high quality replacement battery for your 2012 model can be purchased from Mac Sales: www.macsales.com

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