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how accurate is coconutbattery?
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Junior Member
Join Date: Jul 2009
Status:
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After doing the Apple recommended process for recalibrating my battery it says i went down 15mAh.
My 13in Unibody MacBook is now at 3899 from its original 4100 and is 16months old. When should I be looking into a new battery?
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Posting Junkie
Join Date: Jan 2006
Location: Colorado
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That doesn't seem to be below average. You probably have years left.
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
Status:
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You lost 5% over 16 months. That's awesome actually. You're far from needing a new battery.
Also, you can forget about Coconut Battery. All the battery info you need is already in Sys Profiler > Hardware > Power.
(
Last edited by Simon; Feb 22, 2010 at 03:58 AM.
Reason: typo)
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Junior Member
Join Date: Jul 2009
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According to CB its still dropping, since I made this post its now down to 3826
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Junior Member
Join Date: Jul 2009
Status:
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Posting Junkie
Join Date: Jan 2006
Location: Colorado
Status:
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Are you unplugged? 
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Junior Member
Join Date: Jul 2009
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Yes, but shouldn't my max capacity stay the same either way.
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
Status:
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Just go to Sys Profiler > Hardware > Power and copy-paste the part below Battery Information.
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Junior Member
Join Date: Jul 2009
Status:
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Charge Information:
Charge remaining (mAh): 2206
Fully charged: No
Charging: No
Full charge capacity (mAh): 3860
Health Information:
Cycle count: 397
Condition: Normal
Battery Installed: Yes
Amperage (mA): -1278
Voltage (mV): 11377
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Posting Junkie
Join Date: Jan 2006
Location: Colorado
Status:
Offline
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You're good. No reason to be worried.
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
Status:
Offline
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This is the relevant part.
Originally Posted by AltecXP 
Full charge capacity (mAh): 3860
Cycle count: 397
Condition: Normal
As Apple's tool says your battery condition is 'normal', that is well within spec. I must admit, I'm surprised that after almost 400 cycles you've lost no more than 6% of your original full charge capacity (which IIRC is ~4.1Ah).
You're fine.
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Junior Member
Join Date: Jul 2009
Status:
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I still don't get why it fluctuates so much. Now its 3915.
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Administrator  Join Date: Apr 2001
Location: San Antonio TX USA
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The number provided by coconut, or any other battery monitoring app, is an [Uestimate[/U] of the current capacity of the battery. It's based on the same numbers you get from System Profiler, but the apps calculate other stuff from that, including some sort of "health score." The numbers about the battery themselves fluctuate based on such variables as the ambient temperature, the computer's temperature, how much load the battery has just recently supported versus how much it has supported historically, and others. The value you're talking about is what the Mac itself estimates as the capacity of the battery, probably based on how fast the battery is charging with a given charging current. It's not a "guess," but it's not some rock-solid value you can take to the bank, either.
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Glenn -----OTR/L, MOT, Tx
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