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Power problem on MacBook Pro

Message #1 - Posted 2007/03/23 - Ian McCall

I've noticed my MacBook Pro starting to put itself to sleep, no warning, when the battery hits around 27-30%. It's immediately able to wake again, but quite often when I do the battery reads 0%. However the machine will happily keep running for quite a while - the battery clearly isn't on 0% for real (I'm using it now for example, with 0% showing and having been showing for a while).

I've tried resetting the PMU - any other ideas? Any calibration tricks I can use?

Cheers,
Ian

Message #2 - Posted 2007/03/23 - zoara

On Fri, 23 Mar 2007 09:02:22 +0000, Ian McCall wrote:

I've noticed my MacBook Pro starting to put itself to sleep, no warning, when the battery hits around 27-30%. It's immediately able to wake again, but quite often when I do the battery reads 0%. However the machine will happily keep running for quite a while - the battery clearly isn't on 0% for real (I'm using it now for example, with 0% showing and having been showing for a while).

I've tried resetting the PMU - any other ideas? Any calibration tricks I can use?

Have you done the "let it run to (complete) zero, charge it up to full, rinse, repeat" trick? When the bettery gets so low that it sleeps, you have to leave it unplugged until it dies completely.

It's a bit voodoo but I've fixed one (old) machine that way.

-z-

"The only way to have fun with a Mac is to
poke its insufferable owner in the eye."
- Charlie Brooker

Message #3 - Posted 2007/03/23 - Ian McCall

On 2007-03-23 09:36:15 +0000, zoara said:

Have you done the "let it run to (complete) zero, charge it up to full, rinse, repeat" trick? When the bettery gets so low that it sleeps, you have to leave it unplugged until it dies completely.

Nope, will give that a go this evening then.

It's a bit voodoo but I've fixed one (old) machine that way.

I seem to remember being advised to do that with a Powerbook too, now you come to mention it.

Cheers,
Ian

Message #4 - Posted 2007/03/23 - Jaimie Vandenbergh

On Fri, 23 Mar 2007 09:02:22 +0000, Ian McCall wrote:

I've noticed my MacBook Pro starting to put itself to sleep, no warning, when the battery hits around 27-30%. It's immediately able to wake again, but quite often when I do the battery reads 0%. However the machine will happily keep running for quite a while - the battery clearly isn't on 0% for real (I'm using it now for example, with 0% showing and having been showing for a while).

I've tried resetting the PMU - any other ideas? Any calibration tricks I can use?

http://docs.info.apple.com/article.html?artnum=86284

Cheers - Jaimie

"You know how dumb the average person is? Well, by definition, half of 'em are dumber than THAT." - J.R. "Bob" Dobbs

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