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Any tips on Maximizing MBP battery life?
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Fresh-Faced Recruit
Join Date: Nov 2007
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Quick question really,
I have just seen the light and moved from PC to mac. I have a 2.4 MBP and use it as a desktop replacement where it remains plugged in for about 5 days of the week. Should I be removing the battery to maximize the lifespan? I have seen some posts suggesting this will drop processor speed down to 1 core.
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Dedicated MacNNer
Join Date: Aug 2006
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it won't like running without the battery and you're not supposed to. If you never unplug it, my understanding is the battery won't get hurt. What's bad for batteries is going up, down,up,down 50%, up70%, down 20%,up100, etc.
If you let it cycle all the way down to zero and then charge it, it will last longer. Don't run it off batteries for just a little while and then plug it back in.
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Accept that lithium-ion polymer batteries have limited lifespans, no matter what you do with them. And yes, performance is severely crippled when running without a battery.
That said, I disagree with the advice from zaghahzag. From what I've read, Li-poly batteries like to be mid-charge (40-60%) and never deep-cycled (which is usually below the '0%' mark that the computer would normally allow). If you decide to take the battery out, keep it cool; somewhere like a refrigerator (freezer would be better, but condensation becomes an issue). Read the wikipedia article on prolonging Li-ion batteries; most of the advice also applies to Li-poly batteries.
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Mac Elite
Join Date: Sep 2005
Location: Vancouver, BC
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Performance is severely crippled? How?
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
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Staying plugged in all the time does cause the battery gradual cycle wear because in order to avoid over charging, the system has to stop charging every so often and let the battery run down only to charge it back up again. I let mine discharge to around 40% every couple of weeks.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Originally Posted by Tomchu 
Performance is severely crippled? How?
The chipset clocks the CPU down to 1Ghz and may also disable one core (I'm not sure if the latter happens).
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Fresh-Faced Recruit
Join Date: Nov 2007
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Not arguing at all as I am a complete IT novice - but why would the chipset down regulate when on mains?
Sounds daft!!
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Originally Posted by Orthojim
Not arguing at all as I am a complete IT novice - but why would the chipset down regulate when on mains?
Sounds daft!!
It's due to the lack of a battery tripping some power/thermal protection circuit; I believe it's just an option that Apple 'enforces' rather than something Intel requires, because the Mac mini uses the same chipset and doesn't have the same issue. I've never seen a satisfactory explanation of why they do it.
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Professional Poster
Join Date: Jun 2007
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Originally Posted by Orthojim
Not arguing at all as I am a complete IT novice - but why would the chipset down regulate when on mains?
Sounds daft!!
Yeah its wacky, not sure if any peecee laptops do this (mostly because I don't own a peecee  ) On a plus side, its nice to have the battery in there - your very own UPS so if the power does go out, you don't lose your work.
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