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92% battery health after just 3 weeks
- Thread starter emir
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I have a similar situation with a brand new 2010 13" base MacBook Pro (manufactured end of June / bought 3 weeks ago).
I have 6 charge cycles on the unit and I'm down to 92-93% health. I've done two calibrations in the last week and it keeps getting worse with each recharge. I'm a little worried as I previously had a 2009 15" MBP that was still at 98% health almost a year after I purchased it with over 60 charge cycles.
It's normal. It fluctuates up and down over time. Please read the link I posted, where your question is specifically answered.
you think yours is weird?
http://www.flickr.com/photos/52862707@N04/4876189409/
Photo isn't showing so click on link
http://www.flickr.com/photos/52862707@N04/4876189409/
Photo isn't showing so click on link
Thanks GGJstudios, however I read your link and FAQ before I posted. I understand there is always some fluctuation in battery health (I have noticed 1-2% swings in previously-owned Apple laptops), but losing some 400 mAh after 6 charges / 3 weeks seems a bit extreme. The only thing other thing the FAQ tells me is that "you may have a defective battery"
Also the battery lifespan link in the FAQ appears to be wrong or outdated.
Not extreme at all. I've had my battery health bounce between 91% and 100%. You only need to worry if it drops below 80%.
Thanks for the heads-up, but I just clicked it and it worked just fine. What happened when you clicked it?
Keep in mind that capacity is all estimated. The battery cells have no idea how much charge they have in them. The only way to know the true capacity is to completely deplete the battery with a known current and see how long it lasts until it's dead, and even then, it will be wrong because you will never charge back up to 100% of the previous capacity.
Don't let that worry you though. The delta in capacity is really insignificant.
Sorry...was looking for the battery lifespan info at the bottom of the main content. Didn't notice it it in the right hand column. I appreciate the reply.
Nope, the new batteries are supposed to last 1000 cycles above 80%, the old batteries are supposed to last 300 cycles above 80%.
"Thanks to the breakthroughs of advanced chemistry and Adaptive Charging, the battery in the 13-, 15-, and 17-inch MacBook Pro can go through up to 1000 recharges before it reaches 80 percent of its original capacity — nearly three times the lifespan of typical notebook batteries.2"
Straight from apple's website
but in reference to the OP's question, don't worry unless the goes below 80%, it will fluctuate... a lot
Mines at 95% at 2 months old, 10 cycles
As I've already posted in this thread:
This should answer most, if not all, of your battery questions: Apple Notebook Battery FAQ
no
i dont care what the marketing information is. from experience i have not seen a 1 month mbp have 92% health. i would think losing or starting out that low will produce 80% much faster than what the marketing team says.
i dont care what the marketing information is. from experience i have not seen a 1 month mbp have 92% health. i would think losing or starting out that low will produce 80% much faster than what the marketing team says.
It's not marketing information. It's technical information. Like millions of others, my battery health has fluctuated between 91% and 100% over time. It fluctuates both up and down.
I'd check Activity Monitor to see if there are any background processes that could be the culprit. If your battery is properly calibrated (so the readings are as accurate as possible) and your surfing on Safari isn't to graphic or flash-intensive sites (which can put more load on your system), you should be getting more real (vs indicated) life from your battery.
Ill give you a decent piece of advice. AS apple said reduce your brightness it can double your battery life. I never saw any reason on why to use more than 40-50% brightness on my MBP, especially on the battery.