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I have a Macbook Pro (Mid 2012) 13" unibody and having issues with a battery that is not charging.

Here are the specifics:

  • Battery is not charging
  • Magsafe light not illuminating at all
  • Macbook is being powered off of the charger
  • Current battery charge level remains relatively unchanged as long as the computer is being powered by the charger
  • Macbook will not power up/respond with charger connected and battery removed
  • I have 2 chargers, both exhibit the same behavior
  • I just replaced the battery with a new OEM battery, no change
  • Macbook sees the battery
  • Condition = Normal

Health Information:

  • Cycle Count: 1
  • Condition: Normal
  • Battery Installed: Yes
  • Amperage (mA): 0
  • Voltage (mV): 11898

Here is what I have done so far...

I have replaced the battery with a new OEM battery, but this did not solve the problem. I have also tried doing an SMC reset and a battery recalibration (remove battery, wait 5 seconds, plug in Magsafe, hold power button for 5 seconds, etc...), but none of the common possible fixes have worked. The next step would be to replace the DC-In board, but I wanted to see if I can get any more specific insights before I go throwing more $$ at the problem.

So, my more specific question would be, based on the information I have provided, is if the issue can be narrowed down or isolated to a particular part or area of the system, and/or if there are any other possible fixes or troubleshooting steps I can attempt?

Below is the full text of the system power report:

Battery Information:

  • Model Information:
  • Serial Number: W00505W75D3LA
  • Manufacturer: SMP
  • Device Name: bq20z45
  • Pack Lot Code: 0
  • PCB Lot Code: 0
  • Firmware Version: 201
  • Hardware Revision: 000a
  • Cell Revision: 165
  • Charge Information:
  • Charge Remaining (mAh): 4240
  • Fully Charged: No
  • Charging: No
  • Full Charge Capacity (mAh): 5781

Health Information:

  • Cycle Count: 1
  • Condition: Normal
  • Battery Installed: Yes
  • Amperage (mA): 0
  • Voltage (mV): 11898

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: 14400
  • AutoPowerOff Enabled: 1
  • Current Power Source: Yes
  • Display Sleep Uses Dim: Yes
  • Hibernate Mode: 3
  • PrioritizeNetworkReachabilityOverSleep: 0
  • Standby Delay: 4200
  • Standby Enabled: 1

Battery Power:

  • System Sleep Timer (Minutes): 15
  • Disk Sleep Timer (Minutes): 10
  • Display Sleep Timer (Minutes): 15
  • Wake on AC Change: No
  • Wake on Clamshell Open: Yes
  • AutoPowerOff Delay: 14400
  • AutoPowerOff Enabled: 1
  • Display Sleep Uses Dim: Yes
  • Hibernate Mode: 3
  • Reduce Brightness: Yes
  • Standby Delay: 4200
  • Standby Enabled: 1

Hardware Configuration:

  • UPS Installed: No

AC Charger Information:

  • Connected: Yes
  • ID: 0x0000
  • Revision: 0x0000
  • Family: 0x0000
  • Serial Number: 0x00000000
  • Charging: No
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2 Answers 2

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Check the ac/dc adaptor with a multi meter it should match the writing on the unit. they can run hot and burn out it might be possible to have 2 broken units.

disabling or enabling devices that use power can be used to diagnose a battery problem e.g. blue tooth fire-wire thunderbolt SD CD and DVD drives

Disabling OR enabling as many as possible and changing the settings to low power or high performance should make it last longer or less long. either of these situations confirm a battery problem in a case of less or more charge. a logic board problem would make no difference if you get my drift. The idea is a normal battery would not suffer much impact like this in short term use but a dodgy battery would be very sensitive. Its not really relevant if you can't boot because of no charge.

I've had battery problems before these are my steps I know you have probably tried already but if your desperate it might be worth trying again.

take the back off your mac and check to see all the ribbons are undamaged also check to make sure the the ribbon connectors are not cracked twisted or broken its a common problem when unplugging the battery to damage the connector they are very delicate and require a very light touch.. When unplugging them you cant just flip them out they need even pressure from each side and the middle and gentle levering very tiny amounts at a time if you are in the habit of flipping them out you may have inadvertently damaged them, if you think you may have been careless with the connectors you can get replacements inexpensively and this is a common issue on the mac.

i would disconnect the battery from the logic board and leave it for 15 mins then be very careful to firmly plug it back in using even pressure so all of it is plugged in evenly, be very careful. don't connect the mag. (trying to discharge the mac battery while the mains is plugged in won't discharge the battery). Then close your mac back up and screw it back together. before you plug it in the mag hold down the power button to 15 seconds or longer, something should happen a beep, a flashing light so just wait. if after a while nothing happens plug in the mag. But just wait for something to happen, mac batteries have an issue where they can get all screwed up and need discharging and this is how I would fix it.

the main reason for a battery needing this is usually due to hardware changes (for example recently I'm betting bet you have made some hardware changes like an SSD or just better memory), the mac will work fine for a while after a hardware change then need a negative discharge, its a one time deal and due to a new power setup from voltage changes in the hardware. Replacing the battery won't change the situation as the system still needs to reconfigure its new voltage settings. Don't try to reset the battery with the mains pugged in its all done without any external power, i think its a lot to do with the boot up process and probably unique to MBP.

---edit i edited this to make it more informative and corrected spellings---

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1
  • Thank you, Sam, for the comments. I will give the steps you mention, and that I haven't tried yet, a go. You are correct--I did swap out my drive for an SSD, but that was last Spring. I also just replaced my HD cable as it failed a couple of months ago, not sure how/if that would affect the battery, but it's a possibility, I suppose. I will try going through the process of discharging the battery and having the system reconfigure its power settings as you described.
    – Tom Miller
    Dec 18, 2015 at 17:23
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I had the same issue. I tried everything and nothing seems to work, but then I opened my MacBook and unplugged the battery socket with the charger connected and everything is perfect now.

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