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no low battery warning

Message #1 - Posted 2006/10/02 - Daniel Cohen

I have a PowerBook G4, runnin OS 10.4.7.

It does not display the first low battery warning, the one that occurs at around 20% fullness, half-an-hour time remaining. The battery indicator in the menu turns from black to red, but that's the only indication I have. System Profiler says "First low level warning. No".

Any good ideas on what to do. AppleCare suggested upgrading to 10.4.8, which I've just done a few minutes ago, and the problem remains, calibrating the battery which I did when I got the replacement battery a few weeks ago, and resetting the Power Management Unit, which I did while talking to them and it didn't help.

Might resetting PRAM (which they did not suggest) help? I know it loses some settings.

Or there is a plist that I could edit, but I don't know precisely the effect of that. I would guess that changing one setting from 0 to 1 might help. Or maybe I should just delete it and see what gets created.

http://www.decohen.com Send e-mail to the Reply-To address;
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Message #2 - Posted 2006/10/02 - Florian Zschocke

danspam@f2s.com (Daniel Cohen) schrieb:

I have a PowerBook G4, runnin OS 10.4.7.

It does not display the first low battery warning, the one that occurs at around 20% fullness, half-an-hour time remaining. The battery indicator in the menu turns from black to red, but that's the only indication I have. System Profiler says "First low level warning. No".

Any good ideas on what to do. AppleCare suggested upgrading to 10.4.8, which I've just done a few minutes ago, and the problem remains, calibrating the battery which I did when I got the replacement battery a few weeks ago, and resetting the Power Management Unit, which I did while talking to them and it didn't help.

Might resetting PRAM (which they did not suggest) help? I know it loses some settings.

Or there is a plist that I could edit, but I don't know precisely the effect of that. I would guess that changing one setting from 0 to 1 might help. Or maybe I should just delete it and see what gets created.

Is that a Titanium or Aluminum ?
Is that a original Apple battery or third party ?
I remember there where some third party battery for the Titanium with the label "Hi capacity". These where not able to send the book to sleep. If your PB goes to sleep, I would think you have to do some "deep cycles" with complete charging/decharging. If you did not use your battery for a long time, this will help to get back the full capacity.

Florian

Message #3 - Posted 2006/10/02 - Sn!pe

Florian Zschocke wrote:

[...]

if your PB goes to sleep, I would think you have to do some "deep cycles" with complete charging/decharging. If you did not use your battery for a long time, this will help to get back the full capacity.

See Battery University for authoritative advice:-

<http://www.batteryuniversity.com/partone-12.htm>

----------8<--------
Preparing new lithium-ion for use

Unlike nickel and lead-based batteries, a new lithium-ion pack does not need cycling through charging and discharging. Priming will make little difference because the maximum capacity of lithium-ion is available right from the beginning. >>>Neither does a full discharge improve the capacity of a faded pack.<<< However, a full discharge/charge will reset the digital circuit of a 'smart' battery to improve the state-of-charge estimation
---------->8---------

^œ^

Message #4 - Posted 2006/10/02 - Florian Zschocke

snipe@spambin.fsnet.co.uk (Sn!pe) schrieb:

Florian Zschocke wrote:

[...]

if your PB goes to sleep, I would think you have to do some "deep cycles" with complete charging/decharging. If you did not use your battery for a long time, this will help to get back the full capacity.

See Battery University for authoritative advice:-

<http://www.batteryuniversity.com/partone-12.htm>

----------8<--------
Preparing new lithium-ion for use

Unlike nickel and lead-based batteries, a new lithium-ion pack does not need cycling through charging and discharging. Priming will make little difference because the maximum capacity of lithium-ion is available right from the beginning. >>>Neither does a full discharge improve the capacity of a faded pack.<<< However, a full discharge/charge will reset the digital circuit of a 'smart' battery to improve the state-of-charge estimation
---------->8---------

My experience tells me something absolute different.
It is always the same with the stuff you learn at a university - it is only theoretic.

Florian

Message #5 - Posted 2006/10/02 - Florian Zschocke

Florian Zschocke <edv@zschocke-berlin.de> schrieb:

Unlike nickel and lead-based batteries, a new lithium-ion pack does not need cycling through charging and discharging. Priming will make little difference because the maximum capacity of lithium-ion is available right from the beginning. >>>Neither does a full discharge improve the capacity of a faded pack.<<< However, a full discharge/charge will reset the digital circuit of a 'smart' battery to improve the state-of-charge estimation
---------->8---------

My experience tells me something absolute different.
It is always the same with the stuff you learn at a university - it is only theoretic.

Sorry I forgot. From theory you are right. It is not the electric capacity that becomes bad. If you don't use your battery, the voltage and ampere rate may go down. This is what he saw. There was still 20% left but the current was not strong enough. This is caused by the oxidation of the cathode. The oxidation of the cathode is partial reversible by using the battery. It is still true that your battery will live longer if you discharge it form time to time. I do mine ever 14 days, what works fine.

Florian

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