Late 2011 Macbook Pro battery capacity at %84 of design capacity

reinafromrichmond wrote:

battery life for the macs actually works off of memory; it's designed so that the battery remembers how/to what amount to charge- this is why apple genius support recommends plugging the power chord to the mac, only when it is on the verge of dying: because if you keep plugging it in when it's got a little left on it, in the long run, it will charge less and less. However, if you just bought your mac, I'd recommend def taking it to the Apple store- they're very helpful and do stuff free of charge a lot of the times.

WRONG! Where did you get THAT information. You can leave a MacBook Pro plugged in 24/7, as long as you occasionally let it discharge. Being helpful here is important, but research your facts first.

Apple recommends exercising the thing every month or two to maintain capacity. I know mine took about two weeks before it reached (surpassed, actually) the designed maximum charge capacity as reported by both CoconutBattery and Battery Health. In its zenith, it reached 7173 mAh, of a designed 6900 mAh 😀 Since then it has been degrading gracefully, but still retains a 6990 mAh capacity after 23 weeks and 27 cycles.

As per Apple specs, a unibody non-user-replaceable battery is supposed to retain 80% of its designed capacity up to 1000 cycles. Anything less, especially if within warranty, will probably get you a new one, provided you behave yourself and don't storm the store screaming bloody murder...

I'm not just trying to blurt out answers for the heck of it- This is what two people at my local Apple store (genius bar) told me when I first bought my Macbook Pro. They were very clear and serious about it- stated in the same exact words i used. If you want to shoot someone, shoot the Apple Genius support. -_-

I would certainly take it to an Apple store or AASP and have them do a diagnostic check on the battery. Don't go in demanding one, just tell them this and ask them to check out the battery. If it is faulty, they will replace it free of charge under the warranty.

A tip before speaking to Apple:

found that the battery life was a kind of bad

Use the term "runtime" instead. Runtime is measured in hours. Battery life is measured in years (hopefully)

battery life for the macs actually works off of memory; it's designed so that the battery remembers how/to what amount to charge- this is why apple genius support recommends plugging the power chord to the mac, only when it is on the verge of dying: because if you keep plugging it in when it's got a little left on it, in the long run, it will charge less and less. However, if you just bought your mac, I'd recommend def taking it to the Apple store- they're very helpful and do stuff free of charge a lot of the times.

reinafromrichmond wrote:

battery life for the macs actually works off of memory; it's designed so that the battery remembers how/to what amount to charge- this is why apple genius support recommends plugging the power chord to the mac, only when it is on the verge of dying: because if you keep plugging it in when it's got a little left on it, in the long run, it will charge less and less.

That's crazy talk.

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

So what's the conclusion? Fully drain the battery on weekly basis for best results?