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Battery Callibration

Message #1 - Posted 2004/05/29 - Tim Joseph

Hi,

Just purchased a new 15" PB. The manual said that to maximise the battery life, the PB should be fully charged (until the power light is green) and then run down the battery until it puts itself to sleep - this is supposed to callibrate the battery properly. This should be done in the first week of operation.

Well, for one reason or another I didn't do this until after a couple of weeks in - and even then I would not run it continuously, but use it for short bursts putting it to sleep-wake-sleep etc until the battery ran down fully.

Is this a problem? Is there a chance I've screwed up the callibration?

Can I re-callibrate the battery at a later date?

If I leave the PB to charge overnight, the indicator always comes to 99% - never 100%. Why is that?

Thanks for your advice.

Tim

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Message #2 - Posted 2004/05/29 - Peter Ceresole

Tim Joseph wrote:

Well, for one reason or another I didn't do this until after a couple of weeks in - and even then I would not run it continuously, but use it for short bursts putting it to sleep-wake-sleep etc until the battery ran down fully.

Is this a problem? Is there a chance I've screwed up the callibration?

No, you should be okay. It's not exactly astral navigation- it just ha to be roughly right.

If I leave the PB to charge overnight, the indicator always comes to 99% - never 100%. Why is that?

Because that's what it does in OS 10. In OS 9 it works properly.

Best is simply to switch off the time and percentage indications and only go back to showing Time when on battery power. If the green light shows at the power socket, then even if the software says 98% charge (whch mine does at present), the power manager knows that it's 100% and won't charge further.

I've been using this 667 TiBoko for more than two years now, mostly as a portable desktop machine but also to show slide shows at weddings and suchlike, and I leave it on charge the whole time. So far that seems to suit the batteries fine; LiMH cells thrive on being left fully charged, on charge, not on being charged and discharged repeatedly. --
Peter

Message #3 - Posted 2004/05/29 - Jim

Tim Joseph wrote:

Is this a problem? Is there a chance I've screwed up the callibration?

Can I re-callibrate the battery at a later date?

You can callibrate at any time.

If I leave the PB to charge overnight, the indicator always comes to 99% - never 100%. Why is that?

"Normal" range is anywhere from 95% to 100%. After callibration (once or twice) you should find it goes to 100% *unless* you haven't discharged it much, in which case it may only go to 95%. This is a feature.

Jim

jim@magrathea.plus.com AIM/iSight:JCAndrew2 - Log in and say 'hi' "We deal in the moral equivalent of black holes, where the normal laws of right and wrong break down; beyond those metaphysical event horizons there exist ... special circumstances" - Use Of Weapons

Message #4 - Posted 2004/05/29 - zoara

Tim Joseph wrote:

Is this a problem? Is there a chance I've screwed up the callibration?

No. Apple will do that for you with a software update.

Can I re-callibrate the battery at a later date?

Yes.

The general advice is to do it once every couple of months, but I don't bother.

If I leave the PB to charge overnight, the indicator always comes to 99% - never 100%. Why is that?

Nothing to worry about, and probablyt something to do with this:

http://docs.info.apple.com/article.html?artnum=88344

-zoara-

"Analogies are like Vegemite sandwiches in a paper bag." -- PeterD, uk.comp.sys.mac

Message #5 - Posted 2004/06/03 - Jon B

Can I re-callibrate the battery at a later date?

Yes.

The general advice is to do it once every couple of months, but I don't bother.

Mine gets done once every few days-weeks but thats mainly through coming into the office and forgetting to switch the power on

Jon
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Message #6 - Posted 2004/06/03 - Woody

Jon B wrote:

Can I re-callibrate the battery at a later date?

Yes.

The general advice is to do it once every couple of months, but I don't bother.

Mine gets done once every few days-weeks but thats mainly through coming into the office and forgetting to switch the power on

Mine gets done every day. I use it in the evening and when we let the rats out the power supplies go away, as those thin white expensive power leads are far too tempting to creatures with sharp pointy teeth. As they are out for a while I often see the 'you need connect the power adaptor' box.

Woody
Alienrat Design Ltd
www.alienrat.com

Message #7 - Posted 2004/06/05 - Tim Joseph

Previously, Tim Joseph wrote:

Thank you for your comments.

Best wishes,

Tim

Please remove ".spam" to email me.

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