Old and new battery both ~2 hour life, recently very loud fan

1)
My macbook pro, which was purchased April 2006, had suddenly dropped its battery life from about ~4 hours to ~2 in January. I noticed this because I traveled back home by plane with a 4 hour battery life for winter, and within weeks the life had dropped to ~2.
I already reset the system (i.e., remove battery, hold down start for 5 seconds, etc) with no avail. This was with the old battery. The apple store tried the same thing, was stumped, and decided to just give me a new battery.
The older battery was the replacement for the 'dud' my macbook pro was originally given. This new battery should be perfectly fine, but the battery life is still ~2 hours. I tried the system reset with this battery--which didn't work. I have also reduced the battery life to just about zero then charged it again--which didn't work.
Could there possibly be something wrong with the hardware? What can I do to fix it, what is the best course of action to fix this one problem?
2)
Just a few days ago a fan in the top left corner has begun to behave strangely. It has become very loud and seemingly inconsistent even with low CPU usage. By inconsistent I mean it sounds as if it has become loose or it won't maintain a constant speed. The best description for the sound would be 'boiling water.' What could be the cause for this and how can I go about fixing this problem?
Any input is greatly appreciated!
MacBook Pro Mac OS X (10.4.8) Purchased April 2006

1)
Have you checked your battery's serial number against the MBP battery exchange program? I did this out of curiousity with mine and it turned that mine was one of the faulty ones! So Apple sent me a new one and I sent the duff one back. It was still fairly new at the time so it still held a good charge.
2)
I had the fan thing but mine was on the right hand side. Your BEST bet...(what I did) open up quicktime and RECORD the noise several times at different operating conditions and save the files.
send your machine to a service centre and ask for an email address to send the files to so the technician can hear what you hear. I recorded it behaving normally as well so they could hear the difference.
The 1st time mine went in it behaved itself for them so they had to give it back to me, that's when I recorded the noises! I emailed the files before I sent my MBP back again, they took one listen and said they'd order the fans, BEFORE I sent it in. They called me to say that the fans were in so in it went for the replacement.
Hope it helps - mine sounded like it was going to explode and rip apart the inside! I can email you the files if you like?
Ben

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