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MacBook Pro 2011 Battery

M

MatDave

macrumors newbie
Original poster
Jun 16, 2011
24
0
Southampton, NY
Hi,

I bought a 2011 MacBook Pro a few weeks ago and I watch very carefully on my battery health. And I'm really worrying those days cause the health is only up to 97% and I'm wondering if this is normal, or if my battery health should still be on 100% (according to its usage and age)
I hope someone can help me because I am literally FREAKING OUT! :eek:
Thanks
Mat :apple:


Here are my battery stats :
Current capacity : 6691
Design capacity : 6900 (health 96%)

Age of your mac : 18 weeks
Battery loadcycles : 118
 
If 118 cycles reduces your battery's health by 3% that means you should get 100/3*118=3,893.333 (call it 3,894) cycles on your battery. What are you concerned about?
 
AML225 said:
If 118 cycles reduces your battery's health by 3% that means you should get 100/3*118=3,893.333 (call it 3,894) cycles on your battery. What are you concerned about?
Click to expand...

lol nice. People are too paranoid man.
 
AML225 said:
If 118 cycles reduces your battery's health by 3% that means you should get 100/3*118=3,893.333 (call it 3,894) cycles on your battery. What are you concerned about?
Click to expand...

yes but when i get to the 3,894th cycle, it means my battery health is 0%. i dont even want it to be on 80%.
i'm just wondering if my battery is normal, or if at this point it should still be on 100% ?
 
MatDave said:
yes but when i get to the 3,894th cycle, it means my battery health is 0%. i dont even want it to be on 80%.
i'm just wondering if my battery is normal, or if at this point it should still be on 100% ?
Click to expand...

return it then
 
That's completely normal. While it's easier to go down from 100 to 96, going from 96 to 90 can take a VERY long time. Usually battery levels oscilate between 80-95% for most of their useful years. Keep looking at those levels and you'll see how it just gets stuck there and doesn't decrease all that much at all.

Remember that faulty batteries are covered by Apple 1yr standard warranty.
 
AML225 said:
If 118 cycles reduces your battery's health by 3% that means you should get 100/3*118=3,893.333 (call it 3,894) cycles on your battery. What are you concerned about?
Click to expand...

Battery health isn't linear so this math is wrong. It descends from 100 to 96ish pretty quick but usually stays at that mark for a very long time.
 
ratzzo said:
That's completely normal. While it's easier to go down from 100 to 96, going from 96 to 90 can take a VERY long time. Usually battery levels oscilate between 80-95% for most of their useful years. Keep looking at those levels and you'll see how it just gets stuck there and doesn't decrease all that much at all.

Remember that faulty batteries are covered by Apple 1yr standard warranty.
Click to expand...

thanks a lot! your answer was very useful:)
by the way, with that 1yr warranty, can i really get a free new battery just saying my battery health went down to like 93% (if it happens) ?
 
MatDave said:
thanks a lot! your answer was very useful:)
by the way, with that 1yr warranty, can i really get a free new battery just saying my battery health went down to like 93% (if it happens) ?
Click to expand...

I'm not sure on the details, but I know the battery has to be at a certain minimum % (mAh) depending on the amount of cycles and time. So basically, no, they will only replace faulty batteries. And they will check the actual battery of course, so there is no way around that ;)
 
ratzzo said:
I'm not sure on the details, but I know the battery has to be at a certain minimum % (mAh) depending on the amount of cycles and time. So basically, no, they will only replace faulty batteries. And they will check the actual battery of course, so there is no way around that ;)
Click to expand...

Oh ok!:) well thanks a lot anyway! you really did help me! :apple:
 
MatDave said:
thanks a lot! your answer was very useful:)
by the way, with that 1yr warranty, can i really get a free new battery just saying my battery health went down to like 93% (if it happens) ?
Click to expand...
No. Batteries are only covered by warranty or AppleCare in the case of manufacturing defects. Also, it's normal for your battery health to fluctuate up and down over time.

This should answer most, if not all, of your battery questions:
 
My battery is at 90% health after 19 months and 68 load cycles. Real world performance is about 5.5 - 6 hours before it dies and it was rated for 7 hours performance. So it seems the battery can last quite a long time before it needs replacement.
 
Is it better if you use your MBP as your main CPU (at home) to keep it plugged in always?

Or is it better to let it go from 100% to failure and recharge?
 
johndoejohndoes said:
Is it better if you use your MBP as your main CPU (at home) to keep it plugged in always?

Or is it better to let it go from 100% to failure and recharge?
Click to expand...

No, it's not good to leave it plugged in all the time and it's not necessary to completely drain and recharge. Read the Battery FAQ for details.
 
johndoejohndoes said:
Is it better if you use your MBP as your main CPU (at home) to keep it plugged in always?

Or is it better to let it go from 100% to failure and recharge?
Click to expand...

not always, but it's alright to leave it plugged in for a good amount of time, just make sure you disconnect the charger and let it run down every so often.

you don't really have to be so strict in charging it up to 100%, letting it run down to 0%, and then repeat. just charge it when necessary.
 
vistadude said:
My battery is at 90% health after 19 months and 68 load cycles. Real world performance is about 5.5 - 6 hours before it dies and it was rated for 7 hours performance. So it seems the battery can last quite a long time before it needs replacement.
Click to expand...

19months and 68 load cycles???:eek: seems like you have your mac always plugged in! :apple:
 
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