Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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New battery installed - battery icon has an X in it.

I replaced the battery in my mid-2009 MacBook Pro and the now the battery icon in the upper right-hand corner of the screen has an X in it. It doesn't always happen though. It seems to happen after the laptop has been fully charged and remains plugged in. It's like it only happens when its been charging for a long time, like its a reaction to being over charged. When it's in this state it won't turn on without being plugged in. I haven't quite figured out how it gets out of this state but occasionally it does. This last time, I popped off the back cover of the laptop and unplugged the battery-to-logic board connector and reseated it and then popped the cover back on. Now the computer works fine when not plugged in and my battery is at 100%.

I don't know if this is helpful but this is the info from the System Profiler when the battery reads 88%:

Charge Information:

Charge Remaining (mAh): 5408

Fully Charged: No

Charging: No

Full Charge Capacity (mAh): 5912

Health Information:

Cycle Count: 5

Condition: Normal

Battery Installed: Yes

Amperage (mA): -1247

Voltage (mV): 12048

I find the Amperage being negative odd...

Any body else have this problem? Did I get a bad replacement battery?

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So iFix it sent me a replacement and the problem went away. :)

Answer this question I have this problem too

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Is the X red or black?

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I have now reset the SMC.

No Change. Still has an X in the battery icon.

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Where did you get the battery and did it look opened in anyway - Remanufactured? It's possible to reset the onboard battery info so you can't trust it any more (it's been hacked). What happens when you put your old battery back in?

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Having same problem with 17in Mid 2009 MBP. Battery Icon shows Black X in it.

SMC did not have any effect.

New battery from ifixit.

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1 Answer

I just had this happen after installing a new battery. I had nicked this cable:

https://www.powerbookmedic.com/MacBook-P...

its very fragile and right next to the battery connection to the motherboard.

It also would not fall asleep on close.

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