Macbook battery issue - Dies quickly, jumps to 0%! Details...

Hi all,
It looks like lots of others have had battery issues with their Macbooks, so I'm going to try and give a specific explanation of the problem with my Macbook to see if A) I should replace the battery, or B) There is some sort of problem that I can fix somehow, or C) If I need to take it in to be looked at.
I've owned the 13" Intel Macbook for about 20 months and it currently runs OS X 10.4.10.
If it is charged up to 100%, it will generally run on battery for a short amount of time, usually from 20-30 minutes, and then shut off, as if the battery were empty, with no low battery warning. Oftentimes, the battery percentage is at anywhere from 20% to 40% when it shuts down.
When I plug the magsafe back in, it usually sits at 0% for a while, and then acts like it is charging until it eventually reaches 100%, although it seems like it would be charging too fast to have actually jumped from 0 to 100%.
It's a very peculiar problem. On a side note, I installed a 1GB RAM upgrade (from the previous 512) which was purchased from someone else who owned an intel macbook who was upgrading his own RAM again, just in case that makes any difference at all.
Thanks for any and all help!

BTW, I've allready reset the SMC sevveral times
http://support.apple.com/kb/HT3964
I've also calibrated the battery several times.

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hi!
my battery dies quicker than before, even without using the phone
aslo it shuts down unxpectedly (sometimes shuts down at 30% then i cant restart it until i blog it to the charger)
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Macbook battery issue - Dies quickly, jumps to 0%! Details...

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