Defective MacBook Pro Battery?

[molson2k]

Hello,

I have the latest mid-2012 13-inch MacBook Pro.

Apple states that after 1,000 charge cycles, my battery should still have the ability to retain 80% of its original capacity. My MacBook Pro has only gone through 24 charge cycles and it's already down to 89% of its original capacity. (Full charge capacity of the 13-inch MBP should be approximately 5,750 mAh and it's now at 5,130 mAh)

Now, I mostly use the MBP as a desktop replacement connected to an external display in clamshell mode with external mouse and keyboard. I discharge the battery approximately once a week.

Is it because I leave it plugged in almost all the time that has resulted in its capacity being reduced to 89% or do you guys suspect I have a defective battery and I can go into Apple to get it replaced?

Thanks,

 

[AnonMac50]

It probably is. Contact Apple if possible, see what they say.

 

[T5BRICK]

It's fine. If it drops down below 80%, then take it to Apple. Otherwise, don't worry about it.

You should probably read and follow the instructions Apple provides regarding proper battery care.

http://www.apple.com/batteries/notebooks.html

 

[GGJstudios]

Apple states that after 1,000 charge cycles, my battery should still have the ability to retain 80% of its original capacity. My MacBook Pro has only gone through 24 charge cycles and it's already down to 89% of its original capacity.

It is perfectly normal if your battery health (maximum capacity) is more or less than 100%, even when brand new, or if it fluctuates up or down over time. For further details, read the CHECKING STATUS AND HEALTH section of the following link.

Is it because I leave it plugged in almost all the time that has resulted in its capacity being reduced to 89% or do you guys suspect I have a defective battery and I can go into Apple to get it replaced?

Apple probably won't do anything about it until your health is below 80%. If you're cycling your battery weekly, you should be fine. Your health will fluctuate up and down. It's not a straight decline.

The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.

Apple Notebook Battery FAQ​

 

[molson2k]

Thanks!