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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Notebooks > Battery Life Reduction after update!

Battery Life Reduction after update!
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Aluminum
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Dec 18, 2003, 01:22 PM
 
before the update I had a capacity of 4479 and I could get 4 hours of battery life with reduced setting and the lcd down to about 4 bars. Now after the battery update I have a capacity of 4400 and get around 3 hours and 20 minutes. Very disappointing, I am going to do a full calibration later today, but if that does not address the matter thanks apple for taking time AWAY from my battery. Am I the only one that experienced this. Who else out there that had a good battery before is experiencing this. I can't be the only one here.
15.2" Al/1.25ghz/1gig/Superdrive/80(5400)
     
wunderkind
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Dec 18, 2003, 01:42 PM
 
Same here:

before - 4349
after - 4200.

Predicted time on a battery seems also reduced by 20-30 min.
PB G4 12" 1.5GHz/1.2GB/100GB/SuperDrive/AE/Mac OS X Tiger
     
krux`
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Dec 18, 2003, 03:31 PM
 
well i just checked after i saw this post, this is what i got Before i did the update

"Capacity"=4144,"Amperage"=1200
And this is what i have now

"Capacity"=4400,"Amperage"=1200

So it actually Went up..
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asoares
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Dec 18, 2003, 03:36 PM
 
before 4022
after 4200

Seems that this is a default value. But I've just installed the update. Perhaps it needs a recalibration.

PS. Anyway, before installing the update I was achieving (tought never measured it rigourously) around 5h with reduced settings and one bar display brightness. This of course with minimal disk access reading pdf docs, using openoffice)

PS2. How to uninstall the battery update if I get worse results?

Thanks.
[12" PowerBook G4 1Ghz 768MB/40GB/Combo/APX]
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Spheric Harlot
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Dec 18, 2003, 06:28 PM
 
Before: 3500 (on a nine-month old 12" Powerbook)

After: 3160.

That translates to just over two hours.

Not acceptable.

It's going in for service in January, anyway, so...

And I still haven't been able to find what the Rev.A 12" Powerbook battery is rated at when new.

Anyone? Bueller?

-s*
     
Macfreak7
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Dec 18, 2003, 07:21 PM
 
How do you check this?
     
Aluminum  (op)
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Dec 18, 2003, 09:53 PM
 
ioreg -l | grep -i IOBatteryInfo

enter that into your terminal
15.2" Al/1.25ghz/1gig/Superdrive/80(5400)
     
MacsGalor
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Dec 18, 2003, 11:38 PM
 
or you can always download xbattery and get a whole buch of battery stats
     
ncarandang
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Dec 23, 2003, 09:03 PM
 
pardon my ignorance, but how do you calibrate your powerbook's battery?
     
pknoll
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Dec 23, 2003, 09:31 PM
 
Originally posted by Aluminum:
ioreg -l | grep -i IOBatteryInfo

enter that into your terminal
The -i flag to grep tells it to ignore case, so:

Code:
ioreg -l | grep -i iobatt
is sufficient.
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phantomo
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Dec 23, 2003, 11:13 PM
 
http://docs.info.apple.com/article.html?artnum=86284

dude, you can always do a search first.

pardon my ignorance, but how do you calibrate your powerbook's battery?
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terrancew_hod
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Dec 23, 2003, 11:16 PM
 
Originally posted by ncarandang:
pardon my ignorance, but how do you calibrate your powerbook's battery?
It's fairly simple. Just run the powerbook until it is force into sleep, then charge it back up. I used a DVD movie to run down the charge and I made sure the machine wouldn't go to sleep (set it for 3 hours before it slept).

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LadyBlue
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Dec 24, 2003, 12:23 AM
 
I don't know the stats before hand, but now.
batt #1 - 4200
batt #2 - 4149

is there a way to recallibrate a battery?
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Macdizzy
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Dec 25, 2003, 01:48 AM
 
My 12" 867 PB just had a new battery and with the battery update, it is showing 3:50 hr. This is with LCD set at 5 bars and Wifi on. Programs open are Safari, Excel, temp monitor, mail.

BT is switched off.
     
   
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