MacBook Pro 15" display 모델

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battery and restart issues

I'm having this issue for about a year now:

When I run my macbook pros Battery down, there comes the low battery warning. After a while the system just goes down without suspending anything to my harddisk. When I restart my computer it does a normal start and after logging in I'm experiencing a lot messages due to the reset time. I correct my system-time and restart my mac and the system is back to normal.

Usually I'd say: Replace your CMOS-Battery (I know I have an EFI-Firmware), but where is it?. Or in other words: Is there a "System"-Battery, that would prevent my mac from forgetting the time?

Since I'm not running down my battery to 0 very often I only experience this issue from time to time and never took time to do anything about it.

iStats battery-Status says: Health:83%, Cycles:333, charge 50%...


The Apple Forum helped me out with this. I had not heard of a SMC, which can be reset. (System Managment Controller). I reset my SMC and now the computer has gone back to normal.


1. Power down mac

2. Press shift+ctrl+alt+power button

3. Release all and Power up normaly. (my loading-led was indicating something had been done.)

Thanks a lot!

I'm still not sure, if the models with internal battery pack have another EFI-battery at all.

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Yes there is a PRAM (system/cmos) battery. You can find it here.

If this Answer is helpful please remember to return and mark it Accepted.

MacBook Pro 15" (Model A1150) PRAM Battery 이미지


MacBook Pro 15" (Model A1150) PRAM Battery


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