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View Full Version : Battery capacity dying faster than it should?




johnhalsted
Feb 1, 2011, 07:15 AM
I had my 13" for about 2 months and iv'e noticed the battery capacity is going pretty quickly, im already at 94%, is it worth taking it back to get replaced?

Note: I have calibrated the battery once when it arrived and also do it once per month.

http://i.imgur.com/Z6d53.png
original capacity was 6715



miles01110
Feb 1, 2011, 07:16 AM
Looks fine to me.

johnhalsted
Feb 1, 2011, 07:20 AM
loosing 3% capacity per month? so after 1 year battery will be about 64% after 400 ish cycles at my current rate. And i believe apple say if it goes under 80% capacity within 1 year and it has under 1000 cycles it gets replaced free.

Just wondering if anyone else is having same problem?

miles01110
Feb 1, 2011, 07:24 AM
Battery decay is not linear, depends on use/maintenance, and there is reporting error. You don't have a problem, it is normal.

johnhalsted
Feb 1, 2011, 07:33 AM
Its being used every day and i have been monitoring the total capacity weekly and it has been decaying steadily.

Just also phoned apple and they said if its still going down in a month its going to get free replace :D:D

vocabdude
Feb 1, 2011, 07:39 AM
that's normal, even laptop batteries degrade with time and use, I have a acer laptop which when it was new lasted about 5 hours on battery power, now, after 2 years it doesnt even last 1...

Over Achiever
Feb 1, 2011, 08:39 AM
My battery health went down to 96% last month and today is back up to 98%, I think there are some reporting error involved. I wouldn't worry about it much right now.

b-rad g
Feb 1, 2011, 08:43 AM
My battery health went down to 96% last month and today is back up to 98%, I think there are some reporting error involved. I wouldn't worry about it much right now.

Exact same thing with mine went down to 96% and now back up again.

mattydee87
Feb 1, 2011, 09:07 AM
Yeah my current MacBook Pro battery health often switches from between 86% and 92% all the time

KPOM
Feb 1, 2011, 09:16 AM
I have used 16 cycles since mid-November and am still at 100%. That seems pretty rapid to be down to 94%. Let us know what happens.

GGJstudios
Feb 1, 2011, 10:49 AM
loosing 3% capacity per month?

Your battery is fine. As others have said, your battery health will fluctuate up and down over time. Calibrate your battery to make sure your readings are accurate.

This should answer most, if not all, of your battery questions: Apple Notebook Battery FAQ (http://forums.macrumors.com/showpost.php?p=9875442&postcount=23)