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Help! Macbook pro battery capacity

My 2011 15 inch macbook pro battery life capacity went from 97 percent (6500 something mah) to 83 percent (5732 mah) over night. I shutdown my macbook pro but forgot to switch off the power last night.Help!

MacBook Pro, Mac OS X (10.6.8)

Posted on Jun 23, 2012 12:04 AM

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Posted on Jun 23, 2012 1:29 AM

Try this: It might or might not help but it's worth a try.


Do a SMC/PRAM reset.


Use your battery until it's down to 30% and then recharge it to full and see where your battery capacity is at.


Let me know if that works for you.

34 replies

Jun 23, 2012 4:12 AM in response to eww

Thanks for the reply but the battery may not be defective because i am already past 6 hour of use with continious web browsing on battery and still 27 percent battery left( which is normal for my macbook pro). I am really confused because coconut battery and istat both says battery capacity 83 percent( yesterday it was 97 percent). I know calibration might not help but i want to try it before i take it to apple authorized dealer. No Genius Bar in my country(i m from Nepal). By battery capacity i mean battery health (not charge) just if anyone is confused.

Jun 23, 2012 5:45 AM in response to mondesigns

As mentioned by others, draining your battery fully might do more damage than good to your MB.


That's why I've suggested you run it down to 30% then recharge it again.


OG and EWW's suggestions about not calibrating your battery is dead on.


We're all giving you sound advice. We wouldn't want to see you here in a month's time stating that you're battery is dead after a few months of use.


And since you've mentioned that you've already reach the 6 hour point with your MB on batteries, your MB's battery is in good condition.

Jun 24, 2012 10:03 AM in response to mondesigns

In your previous post, you mentioned that you've gotten over 6 hours of battery usage from your MB.


You do know that once your MB hits a certain percent when charging, it stops the fast charge system and switch to trickle charge.


There are even times that your Macbook is plugged in and will say fully charged but at 95%. That is normal.


Since your MB is sitll under warranty, why don't you just use it and worry about the battery 1 month or 2 before your warranty expires then replace it if needed.


Your one of the lucky ones getting over 6 hours with your battery. So don't worry too much about it.


If it bothers you too much, you can drive down to the Apple store and have them look at it if you wish.

Help! Macbook pro battery capacity

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