Model A1286. Released February 2011 / 2.0, 2.2, or 2.3 GHz Quad-core Intel Core i7 Processor

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Battery taking a long time to charge


I have a MBP early 2011, I have replaced the battery with a genuine apple one. it takes over 12 hours to charge, and only runs for less than 2 hours on battery once charged. So here is what i’ve tried.

  1. Ran battery calibration 3 times as on apple website
  2. SMC reset
  3. PRam reset
  4. multiple genuine apple 85watt chargers
  5. new hard drive with fresh install mac OS (to eliminate any OS settings or software)

I have tried the new battery in another macbook pro early 2011 of exact spec. it charges to full in 2.5 - 4 hours hours with over 5 hours running time on battery. So clearly the battery is not at fault.

So it looks to be a hardware fault, i have ordered the internal magsafe PCB. which I am waiting to arrive. Anyone else have ideas. its starting to look like logic board.

I am an electronic engineer by trade and quite capable of any hardware replacement on this device.


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I would install this gem of an app as it will give you a good view on whats happening inside: CoconutBattery paste a screenshot of the main window and post it here for us to see Adding images to an existing question


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You likely have an issue with the voltage comparator logic which compares the state of the battery. This logic is part of the main logic board. You’ll likely need to get ahold of a good set of schematics to trace out the logic to figure out the problem.

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Lindsay Kirk will be eternally grateful.
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