High amperage?

Since last friday I have these two problems with my three months old latest edition 15 inch Powerbook (all updates on board, including the latest battery update).
After loading the battery, I only have approximately 90 minutes battery life (the percentage is 100, that is, after loading of course). It used to be 270. I checked on system profile, and the problem seems to be very high Amperage (mA): approximately minus 3.000. Am I correc this is much too high? What is normal (using only Safari, with airport on of course, but bluetooth off)? (Full charge capacity of the battery is something like 4.300.)
From the same day on this second problem occurs: after working with the Pb for a couple of minutes, I start hearing a buzz, which gets louder and louder... (well, I shouldn't exagerate, and after 10 minutes fortunately it doesn't get louder any more - but the sound is unacceptable annoying to me). It seems to come from the left loudspeaker, but it doesn't, because it's still there when plugging in a headphone.
These two problems might be connected. When I remove the battery (and get electrity from the cable) the sound doesn't occur.
I tried several things to solve these two problems:
- hardware check (with the upstart cd) (no problems found)
- calibration of the battery
- changing energy options
- reset (shiftctrl+optionstart button as well as, seperately, start button for 5 seconds)
- tried latest battery update for a second time (useless of course).
Nothing seems to help.
Any suggestions, for causes as well as solutions?
Regards,
Martijn

My PB is the series before yours. On a fully charged battery, it shows amperage of -1446 with a full battery capacity charge of 4334.

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