Battery keeps fluctuating between "Replace Soon" and "Normal"

I have noticed that over the past few weeks, my battery continues to fluctuate between 43% health (Replace Soon) and 95% health (Normal).
The weird part is that, when the battery is listed as 95% health, it functions normally (2 hours of charge). However, when the battery is listed as 43% health, it lasts significantly less even when doing the same light web browsing.
Anyone have any ideas? Replace the battery? Is it defective? Thanks!

1, 668 cycles is a good life for a battery that is expected to hold about 80% capacity after 300 cycles.
2. 668 is a lot for an 18-month old battery--that's well over one cycle per day. You are using your battery hard, apparently for hours and hours every day. It shouldn't be surprising that it's being schizophrenic in its reporting to the OS about its status. When you get your new battery--yes, I am sure you need one--treat it better. Use it plugged in when power is available, unplugged when not, and calibrate it every six or eight weeks. Some reading:
http://www.apple.com/batteries/
http://www.apple.com/batteries/notebooks.html
http://docs.info.apple.com/article.html?path=Mac/10.6/en/9036.html

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