[muglo] iBook Power??

I have had a strange effect (at least to me) that perhaps someone can 
explain!!

This refers to the small icon at the top right of the screen which I 
understand indicates the stat of the battery (or at least the power 
situation) in terms of the time left before recharging is necessary 
given as hrs:mins?

Yesterday I had just started up with the power module connected to the 
iBook and the power main on the wall. After a short time on (perhaps 5 
mins) the screen went black and I could nothing to get it back on 
again!
I finally got it back by unplugging the power supply cable to the 
iBook, powering off using the power on button. I then noticed that the 
power indicator icon showed about 8:00 98 hours); this then fairly 
quickly dropped to about 4:00 when it stabilised!
I then tried some testing!!
At this stage the power cord was still disconnected - running on the 
battery only.
The time showed 4:19 and hardly changed
I then plugged in the power supply and the icon changed to (calculating 
... ) and afterwards the time dropped fairly quickly thus
4:15
2:52
1:55
1:25 in a total time of about 3 mins - I was not using the computer 
during this period - just displaying a window and it's contents
During the next minute or so it further dropped to
1:10
0:55
.
.

I then unplugged the power again (at the power module) and got another  
(calculating ... ) message followed by times
8:10
7:00
5:55
5:31
4:58
5:00
4:51
.
.

over a period of about 2 mins!

It would appear therefore as I understand these numbers that it is 
better to run the iBook without the power connection which seems 
strange to me!!  I assumed that it was better to have the power 
connected when using the iBook or am I misunderstanding the meaning of 
this icon?

Or does it mean I have a faulty battery or power module?

Any help would be appreciated

Paul

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