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What should I do if my mac's battery dies within one hour of use? (100-20%)

Lately my macbook air, for a month or so, has been crashing when I'm e-shopping or typing in Word. It has also been dying quicker than ever. My computer used to last around 9 hours of use, but now I'm lucky if I get an hour-and-a-half. I have the 13" Macbook air from late 2011. Yes I do let the battery die then charge until it is full.

MacBook Air, Mac OS X (10.7.5)

Posted on Jul 8, 2013 5:59 AM

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Posted on Jul 8, 2013 6:02 AM

First, go to the apple in the left side of the menu bar, About This Mac, More Info, System Report, Hardware, Power and what does it say about Battery Capacity, Cycle Count, Condition?


You will probably have to take it in for the Apple store genius bar techs to test the system and see if the battery needs to be replaced.

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Question marked as Best reply

Jul 8, 2013 6:02 AM in response to jrr7500

First, go to the apple in the left side of the menu bar, About This Mac, More Info, System Report, Hardware, Power and what does it say about Battery Capacity, Cycle Count, Condition?


You will probably have to take it in for the Apple store genius bar techs to test the system and see if the battery needs to be replaced.

Jul 8, 2013 6:22 AM in response to jrr7500

That looks like a healthy battery, cycle count is relatively low at 186, should be good to around 1,000, the Condition is Normal which it should be unless there is a problem, and a Capacity of 5903 mAh is not far below the as-built capacity of the battery. All batteries drop in capacity as they are used but yours is still good.


It is confusing why that battery should discharge so quickly with a minor load be placed on it. Try charging fully, and then just time the battery life one day so you have an accurate estimate of the charge life.


You can also reboot the Air before doing that to make sure there are no processes running in the background...sometimes things like web surfing and e-shopping end up starting things from the sites visited that run in the background and eat resources.


You can check that by going to Applications > Utilities > Activity Monitor and see what the load is on the CPU...just idling, not having started anything it should be was down in the single digits. If it shows a high CPU percentage, then you have something running in the background eating your power. If that is the case, you can look at the listing of Processes and see what is using the high CPU percentage, then ask about killing that process...be sure to ask first so you don't stop something you actually need to have running.


One last thought, have you by any chance installed anti-virus software of some sort? Those programs run and really, really eat resources.

What should I do if my mac's battery dies within one hour of use? (100-20%)

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