How do I remove the PRAM battery?

I leave on tuesday morning to go overseas. I've been told to remove the PRAM battery from my Power Mac before leaving.
How do I do this?
Regards,
Daniel

Not familiar with your model G5 as I have an original DP2.
There are more views of the internals here
http://docs.info.apple.com/article.html?artnum=86790
As you can just about see in the second diagram there, some models were fitted with a 'button' cell, shown more clearly here
http://manuals.info.apple.com/en/Battery.pdf
- but it still seems to be in roughly the same place. I would have thought yours had a 1/2 AA lithium battery.

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