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Der Mac Pro (Anfang 2009) kam im März 2009 auf den Markt. Er führte erstmals die Nehalem Architektur von Intel in die professionelle Apple Desktop Reihe ein, und verfügt über ein leicht neu konzipiertes Inneres, das auch bei den 2010 und 2012 CPU Updates beibehalten wurde.

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RAID Card battery not charging in computer

About a year ago, the RAID card in my Mac Pro was giving errors about the battery, so I followed the instructions on this site to fix it. I bought a new battery, had to remove the PMC board, and while it took me some time, I got it all working. Last month, I had the same problem with a different machine and so followed the same steps, but this time it does not work, the battery does not charge when put back into the Mac Pro. I have then also taken the initially repaired one apart, and this one now no longer charges either.

I am charging the battery to a bit over 3.7V externally and then put them into the Mac, which claims to be charging them (according to raid utility) and that takes about 7-8 hours and then it stops with an error, the battery would then meanwhile have lost some charge and only be around 3.65V.

I have tried the discharging, recharging multiple times all without luck. I am suspicious that either the RAID card or the battery management system are somehow locked and not providing current to the battery to charge, any advice on how to find out (I tried to measure the current, but it seems to be changing continuously) and/or get to a successfully charging battery ?

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Just wondering if you managed to fix your problem?

I stubbled across exactly the same problem as yours. I installed the new battery, it finished reconditioning after 9 hours, Then gave battery failed error. On restarting the Mac Pro, it said normal battery operation, working battery, 'charging''but wouldn't charge despite leaving the Mac pro on for 24 hours.


Uzair, sorry after so many attempts of discharge, recharge, and reboots and so on, I ended up giving up. Wanted to give it some rest before getting back at it, if still relevant taking that the machine may soon no longer be supported for OS updates.


Hi Wim, I initially gave up as well. But then after that update and discharging up to 3.55v and recharging up to 3.66V, it suddenly started to work for me. It my be worth having another go. If you run Mojave, I guess will continue to get OS support for another few years but I might be wrong.


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The following worked for me. (Mac Pro 4,1 flashed to 5,1)


Installed the new battery in, it did 1st cycle of conditioning Ok then came with with battery failed error.

I restarted the Mac Pro, the battery status was shown normal and I automatically stated reconditioning again. After 9 hours this cycle completed and status said charging with orange dot against the battery. After 24 hours, still charging. I then put another new battery in, the status said charging but there was again no charge on the battery.

Then the following two things happened.

1) I discarded the battery to 3.5V via bulb(took a few hours). Then recharged it to 3.66V and Put the battery back in.

2) After 3 hours my Mac Pro downloaded the automatic updates. I was not planning to restart but when I went away from desk, it restarted. It seemed like a major update as it took 10 minutes to finish installing (with apple bar). I was running Mojave and relatively new install and needed a few updates as did not use much after installing. On looking back it looks like security update 2020 - 003 (may not be relevant).

3)When the computer restarted, guess what it showed full battery with all three green dots in the utility. (a pleasant sight after a few days of trouble shooting)

I then restarted in Sierra, still showed good. Then put the card in Mac Pro 4,1 and worked just fine with all green dots.

Its been two days and all seems good.

My impression since both things happen simultaneously so not sure which of the above two worked. You could try both and see if this works for you. It could be discharging and recharging made the raid card sense the charge on the battery. Or the other theory could be the resetting of the raid utility after a major update sorted things out. If your system is already updated then may be worth to try installing new Mac OS on a separate partition or on the same after backup to see if this works. I hope this helps someone. It took me a few days of troubleshooting for my battery installation to work.

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Dear Uzair, thanks for the info, so I guess Mojave (or another version of OS) may help, but I cannot run Mojave due to the graphics card not being compatible. I tried many discharge/recharge cycles including reboots, but may give it a try again at some point in the future.


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Wim Melis wird auf ewig dankbar sein.

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