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Speaking about bad batteries...
 

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Batteries are not suppose to be covered under extended warranties or service plans. However, if your battery is deemed 'bad' then Apple is usually nice enough to replace it.

Don't expect them to replace it once you've done over 700 cycles though. The only reason they would replace it is if you had like 50-100 cycles and saw a dramatic drop in the life of your battery.
 
Also just to be clear, if the battery is faulty and you're under warranty it will be replaced free of charge but say it's been 1 year or later and no AppleCare and your battery decides it wants to not hold a charge, there will be NO replacement either. Batteries are not given special treatment and is a part of the computer so if you're not covered under AppleCare you'll have to pay for a repair or in this case a new battery just like you would if the logic board or HDD were to fail.

(Of course there will be someone here that post "well I had mine replaced free when it I was not covered", that is a isolated issue and was given to you for customer satisfaction purposes so please don't take that as something Apple does because "it's not right" or "not fair")
 
mine's had maybe 900 cycles, and the battery literally would last 20 minutes after being charged all night. i got mine at the same time as you, december 06, macbook pro. its quite annoying, as it is no longer portable so to speak

I was planning on giving AppleCare a call tomorrow just to ask nevertheless but now feel my battery might be doing pretty well.

744 cycles and iStat Pro tells me the battery "health" is at 91%. The lowest i've seen the health is at 89% when when the Mac is running on battery and it's about to die.

I've tested my Macbook and the battery seems to last alone for about 2 hours on the brightest screen setting and only minor web browsing or heavy essay typing. Watching a DVD or Hulu or YouTube will knock it to about an hour. If I dim the brightness to a low setting, I've gotten an 18 page essay done within 3 and a half hours on just the battery, though i'd recommend writing an essay with a brighter screen.

When I hear you're saying it's only lasting 20 minutes it makes me feel better about mine, seeing as I need portability from my Macbook....

...The thing is, I can't for the life of me remember what the healthiest longest battery life I can get from my Macbook. I searched on eBay for batteries and it's interesting that there are original apple macbook batteries but also these off brand ones that still work but aren't great. The prices for the original apple batteries were like $70, while the off brand ones were $40-$60. The off brand models mentioned fully charged the battery will last about 2 hours. So not worth it since that's what i'm getting.

But i'm wondering what about the original apple batteries?

I wouldn't upgrade to just get an hour more, to 3 hours on a full bright charge...but something like 5 hours and i'm sold.
 
744 cycles and iStat Pro tells me the battery "health" is at 91%. The lowest i've seen the health is at 89% when when the Mac is running on battery and it's about to die.

That sounds about right. Apple says that after 300 cycles your battery should be at 80% health.

Mine is at 93% after 73 cycles, I think I should be giving Apple a call? :(
 
That sounds about right. Apple says that after 300 cycles your battery should be at 80% health.

Mine is at 93% after 73 cycles, I think I should be giving Apple a call? :(

Hmm.. how do you guys determine the percentage of the battery health?
 
Hmm.. how do you guys determine the percentage of the battery health?

download istatpro widget or the program itself, which i'm sure'll give you more info that just the widget.


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I'm confused as how some people with 300 cycles have only 80% health while my almost 800 charges is at 91% health?
 
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