Need advice - should I replace PRAM battery even if I don't need to?

I'm getting ready to open up my iMac to replace the internal memory and DVD drive. While I'm inside, I was thinking I should go ahead and replace the battery. I keep my machine on 24/7. I have no idea how long a battery lasts. Its woking fine now. But since I'm opening up the machine and using thermal paste, and all, should I also replace the battery?
I assume pulling it out to replace it resets the PRAM. Not sure what effect that will have on my machine. What will be reset? Could it cause me any problems? What settings will I lose? I could always wait until the battery goes and then replace it. Is that a better idea? I don't know anything about PRAM, etc.
Thanks,
Alfredo

Alfredo
Mac OS X: What's stored in PRAM? will answer your question.
Since you are going through the effort to replace the DVD drive, the loss of PRAM settings is the least of your worries. I presume that you have the necessary technical knowlege, tools and skills to perform this surgery, and as long as you have gone through the effort to open the case, I would also advise that you take this opportunity to replace the battery.
;~)

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