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halledise
13th January 2007, 05:31 AM
Am experiencing a curious thing with the battery of my white C2 Duo MacBook. Initially it held good charge and went forever but now, 2 months later, in seemeth to be lacking.

Coconut battery is showing all to be normal, yet when I went away for a few days this week, I left it switched off at approx 85% charge yet when I fired it up again 3 days later it showed just 6%.

Where's the power going to?

My nephew has a rev A MB - oe of the first to be released here in Aus, and his battery is cactus already. He's off to the Mac shop for a replacement as soon as he returns from 6 months o/s with the family.
From his last email, he's reduced to internet cafes in Europe as the MB will only work when attached to the power cord.

& yes, we've reset the power management on both machines, repaired permissions and done the pram/nvram reset thing.
bit of a mystery really ...................:( :confused:

ClockWork
13th January 2007, 06:49 AM
Halledise - the power does just wane, in the same way as any product that one leaves a battery inside of. If you leave a battery inside a torch, and then leave the torch untouched for a long period of time and then comes back to it later, then yes, one notices it has become discernibly dimmer.

Same goes for your MacBook - (or an iPod, or a mobile phone). If you let it charge down to say: 50% and then remove it from your MacBook, and store it in a nice safe cool dry place - and then go away for a week, when you return, and put the battery back in your MacBook, you'll see it has retained its 50% of power, because - "on" or "off" - as long as it's making contact with the MacBook's contact points, electricity will just drain away in time.

See Apple information here (http://www.apple.com/batteries/notebooks.html) that talks specifically about how to maintain the battery life of an Apple product.

You can also try calibrating your Mac Book's Battery - re the following steps:

1. Plug in your power adaptor and allow your MacBook to fully charge, until the power adaptor changes to green and the onscreen meter is as high as it will go - something like 98% or 99%.

2. Let the battery rest in its fully charged state, with the power adaptor still plugged in for 2 hours. You can use your MacBook within this two hour period of time, yet the power adaptor must be plugged in.

3. After the 2 hours has elapsed, pull out your power adaptor so that your Mac Book is running off just its battery. You can either use it during this time - or make it play a long DVD movie. When your Mac Book's battery starts getting low, you'll see a low battery warning dialogue on your screen. Ignore this and let it keep running off the battery alone, but if you're doing any work, save it now.

4. Continue to keep your MacBook "on" battery alone, until it goes into its low power Sleep Mode.
Leave it in this Sleep Mode for 5 to 12 hours, depending on how well you want this to work - or how patient you are.

5. After the elapsed 5 to 12 hours of your MacBook in low power Sleep Mode, connect the power adaptor to it. It will immediately spring back to life. Shut it down immediately.

6. Leave it "off" and charging for another 8 hours.

This process is known as : Battery Calibration - or - Battery Reconditioning and it should be performed ideally once a month to lengthen the life of your MacBook's battery.

Note to anyone else reading this: This Battery Calibration method is only for Mac Book, Mac Book Pro, and the last PowerBook G4 15-inch Double-Layer SuperDrive Model that Apple produced, as they all contain Lithium Polymer batteries.

There is a different Battery Calibration process for the other Powerbook G4s and iBooks, which use Lithium-Ion batteries.

Halledise - suggest you try this method of Battery Calibration on your MacBook, and then see if it holds power again in the same way it did when you first bought it.

It is very worthwhile performing this procedure of charging and then discharging the battery when you first purchase your MacBook or MacBook Pro.

cheers,

cw

adam89
13th January 2007, 08:27 AM
your nephew's issue is common among those having problems with their macbooks..

never heard of a problem like yours though...

Currawong
13th January 2007, 11:55 AM
Was it shut down or in sleep? Batteries will lose power over time, even when not plugged in to anything. There is possibly a small battery drain when it's in a machine, but that sounds a bit fast...

ClockWork
13th January 2007, 12:04 PM
The other possibility is that somebody is using it while you're away... until they see the 'low battery warning' appear - then quickly shut it down and put it back.

cw

halledise
14th January 2007, 04:19 PM
The other possibility is that somebody is using it while you're away... until they see the 'low battery warning' appear - then quickly shut it down and put it back.

cw

lol - yeah that occurred to me too! but the kidlets are a little older than to do that these days!