Only slow charging and none while sleeping

Hi! I have a 17" 1,67 MHz PB with a charging problem. The time to charge displayed in the menu bar can change from more than 10 hrs to several hundred. When the computer sleeps it doesn't charge at all, although the power adapter light is amber all the time.
I have noticed that the charging is depending on what I do on the computer. If I just leave the computer on, the charging goes to almost nothing less than 10 mA. When the screensaver starts the charging increases to more than 300 mA, but that is still very slow.
It seems like the fast charging is not working and only the trickle charge that should start at 80% works.
I have done all the usual stuff, reset PMU, tried different charger, new battery, but nothing have worked. I have run Tech Tool Pro, and no problem is reported. I don't have the Apple Hardware test CD, but what I have heard is that Tech Tool does the same tests or more, right or wrong?
As everything else works I can live with this problem, but if there is an easy fix I would be more than happy. Can the DC-in board be the problem or the logic board? Where is actually the circuits located that controls this stuff?
Thanks, Leif
PB 17"   Mac OS X (10.4.9)  

How long did it take to charge the battery ?
About 40 hours to 92%, then it stopped, although the charger did not turn to green. But the charging icon switched to a power plug icon on the menu bar. To this time should be added the time the computer was sleeping and not charging at all, despite the amber light was on.
Fresh batteries require some cycles before they reach
their full capacity. So I would consider this as
normal.
You may keep an eye about this and - if nothing
changes - ask the seller for a replacement (but you
should consider that +/- 5% are in an acceptable
range).
Ok.
Have you followed the instructions provided by Apple
to calibrate a new battery ? See
http://search.info.apple.com/?search=Go&lr=lang_en&kwo
rd=&type=&newstype=&q=calibrate%20battery
Yes, I did this, but as I said, the battery only went to 92% so the calibration was not fully completed.
I recorded the charging with MiniBattery Logger and you can see the graph here: http://www.lignell.net/charging.png
The red line is the amperage and the amber is current charge level. The steep parts of the curve is when the screen saver starts. The dotted line is when sleeping. The amber charging icons means the charging starts after a stop. At the end the charging starts and stops all the time. The big red negative spike at the end is when running on battery only. Green line means it is "fully" charged (92%).
I hope this clarifies my question a bit. I think a normal charging should take a few hours only, without interruptions. The charging current never goes above 400 mA, and it should be more than 1000 mA.

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